What Does a Speech and Language Therapist Do? A Complete Guide for Families and Adults

A speech and language therapist is a healthcare professional who assesses and supports difficulties with communication, voice, fluency and swallowing, in people of all ages — from babies taking their first feeds to adults recovering after a stroke or brain injury. They work out what is making communication or swallowing difficult, agree goals with the person and their family, and provide therapy, practical strategies and guidance shaped around everyday life.

The name can be a little misleading. Speech and language therapy is about far more than speech sounds: it covers how we understand words, how we build sentences, how we take part in conversation, how our voice works, how fluently we speak, and how safely we eat and drink. Many people only come across the profession when they or someone they love needs help, and it is common to wonder what a therapist actually does all day.

This guide explains the role in plain language: the people a speech and language therapist works with, the difficulties they support, what an assessment involves, what therapy sessions look like, where therapists work, and how the role fits alongside teachers, doctors and other professionals. It cannot say what any one person needs — only an assessment can do that — but it can help you understand what to expect and feel clearer about the next step.

Key Takeaways

• A speech and language therapist supports communication, voice, fluency and swallowing in children and adults of all ages.
• The work covers much more than speech sounds: understanding language, expressing ideas, conversation, reading and writing, voice, stammering, and eating and drinking safely.
• Assessment comes first: the therapist builds a picture of a person’s strengths and difficulties before suggesting any therapy.
• Therapy is shaped around goals that matter in everyday life — a child’s first words, a family conversation, a safe and enjoyable meal.
• Therapists work in clinics, schools, hospitals, homes and online, and alongside doctors, teachers and many other professionals.
• Progress varies from person to person. A good therapist will agree goals with you, review them honestly, and explain what therapy can and cannot do.

On this page

• Helping children communicate
• Helping adults communicate and swallow safely
• Assessment: building the full picture
• What therapy sessions involve
• Where speech and language therapists work
• Working alongside other professionals
• How the role differs from other roles
• Online therapy
• When to seek help
• Questions to ask a therapist
• Frequently asked questions
• Related guides

Helping children communicate

A large part of speech and language therapy is with babies, children and teenagers. Communication skills develop gradually through childhood, and children can need support at any point along the way — with understanding, with talking, with speech sounds, with social communication, or with feeding. Therapists who work with children often do so through play, everyday routines and the people around the child, because young children learn communication best while doing things they enjoy, with the adults they know best.

Speech sounds

Some children find it hard to produce the sounds of speech clearly. Their words may be difficult for family to understand, and even harder for people who do not know them well. A speech and language therapist can assess which sounds a child is finding difficult and how this affects their speech, then work on listening to sounds, producing them accurately, and using them in words, sentences and everyday conversation. For a smaller number of children, the difficulty lies in planning and coordinating the movements of speech itself; this pattern is known as childhood apraxia of speech, and therapy for it is structured differently, with frequent, carefully guided practice of speech movements.

Language development

Language is bigger than speech. It includes understanding words and sentences (receptive language), and using words and sentences to express thoughts, needs and ideas (expressive language). A therapist supports children whose language is developing more slowly than expected, or in a different way — sometimes described as a language delay, and for some children as developmental language disorder. Therapy might involve building vocabulary, helping a child understand questions and instructions, supporting them to put words together into longer sentences, and coaching parents and teachers in the everyday interaction strategies that help language grow.

Social communication

Communication is also social: taking turns in conversation, understanding other people’s feelings and points of view, reading facial expressions and body language, and adjusting how we speak to different people and situations. Some children — including many autistic children and children with attention differences — find this side of communication difficult. A speech and language therapist can help a child understand social situations more clearly, support their friendships and classroom participation, and work with families and schools on environments and approaches that make communication easier. For children who are not yet speaking, or whose speech is very limited, the therapist can also introduce other ways to communicate, such as signing systems, picture-based communication, or speech-generating technology — described by type, and chosen to suit the child. These approaches sit alongside spoken language; they give a child a voice while speech develops, and for some children they remain an important part of how they communicate.

Stammering in children

Many young children go through a phase of repeating words or sounds as their language develops rapidly. For some children, stammering (also called stuttering) continues, and speaking can become effortful or something they try to avoid. A speech and language therapist can assess a child’s stammer, support parents with helpful ways of responding at home, and work with the child in ways suited to their age — always aiming for comfortable, confident communication rather than putting a child under pressure to speak in a particular way.

Feeding and swallowing in children

Some babies and children have difficulties with feeding: chewing, moving food around the mouth, or swallowing safely. A speech and language therapist with feeding expertise can assess how a child eats and drinks, identify where the difficulty lies, and advise families on positioning, pacing and the textures a child can manage safely. Because swallowing difficulties carry a risk of food or drink going into the airway, feeding advice is always based on an individual assessment — never on general information alone. The therapist may also work alongside dietitians, doctors and other specialists where a child’s feeding is part of a wider picture.

Helping adults communicate and swallow safely

Speech and language therapists also work with adults whose communication or swallowing has changed because of illness, injury or a long-term condition. The focus is functional: helping the person take part in conversations, relationships, work and daily life as fully as possible, and eat and drink as safely and enjoyably as possible.

Aphasia and communication after stroke or brain injury

When the language areas of the brain are injured — most often by a stroke, but also by head injury or other illness — a person may develop aphasia: difficulty finding words, building sentences, understanding what others say, or using reading and writing. Their intelligence and personality are not lost; the bridge between their thoughts and words has been damaged. A speech and language therapist assesses how language has been affected, works with the person on rebuilding language skills step by step, and teaches strategies and tools that help them get their message across. Just as importantly, the therapist coaches partners and family members in ways of supporting conversation, because communication is a shared activity.

Cognitive-communication difficulties

After a brain injury, some people find that the thinking skills behind communication have changed: attention, memory, organisation, reasoning and awareness of social cues. Conversation may become disorganised, overly detailed, or difficult to follow; the person may talk over others, lose track of topics, or struggle to plan what they want to say. A speech and language therapist assesses these cognitive-communication skills and works on practical strategies — for conversations, for everyday tasks such as phone calls and appointments, and for returning to study or work where that is a goal.

Motor speech difficulties

Speech can also be affected by weakness or poor coordination of the muscles used for speaking, as happens in dysarthria, or by difficulty planning and programming speech movements, known as apraxia of speech. Speech may sound slurred, slow, strained or imprecise, and familiar listeners may cope better than strangers. A therapist assesses how speech is produced, works on clarity and naturalness where that is possible, and helps the person find other ways to support their message — pacing, gestures, writing key words, alphabet boards or speech-generating technology — so they can still be understood.

Voice difficulties

The voice can become hoarse, weak, strained or tired, or change in pitch, for many reasons — heavy voice use, illness, changes in the vocal folds, or muscle tension around the voice box. A speech and language therapist who works with voice can assess how the voice is being produced and sounding, advise on everyday voice care, and guide exercises and techniques aimed at healthier, more comfortable voice use. Because some voice changes have medical causes, a therapist may advise that a doctor or ear, nose and throat specialist also examines the vocal folds, especially if hoarseness lasts more than a few weeks.

Fluency in adults

Stammering does not only affect children. Adults who stammer may have stammered since childhood; occasionally, stammering begins in adult life after a brain injury or illness. Therapy for adults focuses on speaking more comfortably and confidently, managing difficult situations, and reducing avoidance — for example, of phone calls, presentations or particular words. There is no single approach that suits everyone, and honest therapy does not promise fluent speech; it builds communication confidence and choice.

Swallowing difficulties (dysphagia)

Swallowing is a precise, partly automatic process, and it can be disrupted by stroke, brain injury, neurological conditions, illness or frailty. Difficulty swallowing — dysphagia — can make eating and drinking slow, effortful or unsafe, with a risk of food or drink entering the airway (aspiration), which can lead to chest infections. A speech and language therapist assesses swallowing carefully, sometimes using instrumental examinations arranged through medical services, and recommends how the person can eat and drink as safely as possible. This may include strategies for positioning and pacing, and changes to food textures or drink thickness — but only ever as an individual plan, taught and reviewed by the therapist or medical team. Swallowing rehabilitation exercises are sometimes part of a plan; where they are, they are chosen for the individual, taught carefully and supervised, because an exercise that helps one person may not be safe for another.

The table below summarises who a speech and language therapist typically works with.

Who	Examples of difficulties	What support can look like
Young children	Slow language development, unclear speech, stammering, feeding difficulties	Play-based therapy, parent coaching, sound and word practice, feeding assessment and advice
School-age children and teenagers	Language disorder, social communication difficulties, speech sound difficulties, stammering	Direct therapy, classroom strategies, support for friendships, exams and transitions
Adults after stroke or brain injury	Aphasia, cognitive-communication difficulties, dysarthria, apraxia of speech, swallowing difficulties	Language and communication therapy, conversation partner coaching, swallowing assessment and plans
Adults with voice or fluency difficulties	Hoarseness, vocal fatigue, muscle tension in the voice, stammering	Voice care advice, guided voice techniques, confidence-building communication work
Adults with long-term conditions	Communication and swallowing changes linked to neurological or other illnesses	Assessment, strategies and aids, family guidance, regular review as needs change

Assessment: building the full picture

Whatever the age of the person and whatever the difficulty, assessment comes first. A speech and language therapist does not begin therapy from a label alone; they build a picture of the individual’s communication or swallowing — what is difficult, what is strong, what it affects in daily life, and what the person and their family most want to change. An assessment is not a test to pass or fail, and it should never feel like an examination in the school sense.

In general terms, an assessment may involve:

• A conversation about the person and their history. For a child, this usually means talking with parents about development, health, feeding and how the child communicates at home and at school. For an adult, it means hearing what happened, how communication or swallowing has changed, and what matters most to them and their family.
• Observation. Watching a child play and interact, or listening to an adult in conversation, often tells the therapist a great deal about real-life communication — sometimes more than any formal task.
• Structured tasks and activities. Depending on the person’s needs, these might include naming pictures, following instructions, describing events, reading or writing tasks, producing speech sounds, voice tasks, or eating and drinking everyday foods and drinks so swallowing can be observed. The tasks are chosen to suit the person’s age and situation.
• Thinking about the whole person. Hearing and vision, memory and thinking skills, mood, energy, physical health and the support available at home and school or work all shape communication — and therefore shape what therapy should look like.
• For swallowing, careful safety checks. Where swallowing is a concern, the therapist pays close attention to signs of difficulty during eating and drinking, and may recommend further instrumental assessment through medical services to see the swallow in detail.

Afterwards, the therapist should explain their findings in plain language: what they noticed, what it means in everyday terms, and what they recommend — whether that is therapy, strategies to use at home, monitoring over time, onward referral, or a combination. This explanation matters. Understanding the difficulty is often the first step towards feeling less anxious about it, and it gives families a shared language for talking about progress.

What therapy sessions involve

There is no single shape to a therapy session, because therapy is planned around the individual. Even so, some features are common across ages and difficulties:

• Goals agreed together. Sessions work towards goals chosen with the person (and, for a child, with their parents) — goals that matter in real life, such as being understood by grandparents, joining in class discussions, ordering a coffee independently, or eating a family meal safely.
• Activities matched to the goal. With children, therapy is usually play-based and built into games, stories, songs and everyday routines, so practice feels like fun rather than work. With adults, sessions might involve structured language practice, conversation work, voice techniques, speech practice or swallowing rehabilitation, depending on the goal.
• Guided techniques, taught individually. Some approaches you may hear named include melodic intonation therapy and semantic feature analysis for aphasia, constraint-based language practice, dynamic temporal and tactile cueing for childhood apraxia of speech, and breath support and phonation work for voice. What matters more than the names is this: techniques and exercises are selected for the individual after assessment, taught carefully by the therapist, and reviewed as the person progresses. This is especially important for anything involving swallowing, where exercises and texture changes must be individually prescribed and supervised because of the risk of choking or aspiration.
• Practice between sessions. Skills grow through regular use in real life, so the therapist usually suggests short, manageable practice woven into daily routines — and shows the person or family exactly how to do it.
• Regular review. Progress is checked against the agreed goals. Plans change as the person changes: goals are achieved, new priorities emerge, and therapy adapts.

Session frequency, length and duration of a course of therapy vary widely. A therapist should be honest about what they think therapy can achieve, about the fact that progress varies and cannot be promised, and about when a break, a different approach, or input from another professional would be more helpful than continuing unchanged.

Where speech and language therapists work

Speech and language therapists work in a wider range of places than many people expect. Settings, described by type, include:

• Clinics and health centres, where children and adults attend appointments for assessment and therapy.
• Hospitals, including wards for people recovering from stroke, brain injury or illness, intensive care units, and outpatient services — swallowing and communication support in hospital is often urgent and time-critical.
• Schools and nurseries, where therapists assess children, provide therapy, train staff and help shape classroom communication environments.
• People’s own homes, particularly for adults whose mobility or health makes travel difficult, and for therapy that needs to happen in the person’s real eating and living environment.
• Care homes and community services, supporting adults with long-term conditions, and training care staff in communication and safer eating and drinking.
• Independent practice, where families and adults arrange assessment and therapy directly with a therapist, in person or online.

Wherever the setting, the core of the work is the same: understand the person’s communication or swallowing, and work with them — and the people around them — towards goals that improve everyday life.

Working alongside other professionals

Communication and swallowing sit at the crossroads of health, education and daily life, so speech and language therapists rarely work in isolation. Depending on the person’s needs, they may work alongside professionals such as:

• Doctors — family doctors, paediatricians, neurologists, stroke physicians, ear nose and throat specialists and rehabilitation consultants — who investigate and treat the medical side of a condition.
• Teachers and school staff, who see a child’s communication all day and can build strategies into classroom life.
• Occupational therapists and physiotherapists, who support everyday activities, movement, posture and positioning — all of which affect communication and swallowing.
• Dietitians, who advise on nutrition and hydration, particularly where eating and drinking are difficult.
• Psychologists, who can support thinking skills, learning, behaviour and emotional wellbeing.
• Health visitors, nurses and care staff, who often notice changes first and carry out day-to-day plans.
• Audiologists, because hearing underpins speech and language development, and hearing changes can affect adults’ communication too.

Good teamwork means information is shared (with consent), recommendations do not contradict each other, and the person and their family are not left carrying messages between professionals. If you are not sure who does what in a team supporting you or your child, it is always reasonable to ask.

How the role differs from other roles

Because several professions touch communication, the boundaries are worth explaining — with respect for every role involved.

• A teacher educates the whole class and is often the first to notice that a child’s communication stands out from their peers. Teachers adapt their teaching and carry strategies into the classroom, and their observations are invaluable. A speech and language therapist’s role is different: they assess the underlying communication difficulty itself, work out why it is happening, and provide individualised therapy and specialist advice that the teacher can then build on.
• A doctor diagnoses and treats medical conditions — the stroke, the infection, the vocal fold problem, the developmental condition — and manages medication and medical care. A speech and language therapist focuses on the functional consequences for communication and swallowing: how the person understands, expresses themselves, uses their voice and eats and drinks, and what therapy and strategies can do about those difficulties. The roles are complementary, and each may refer to the other.
• A speech and language therapy assistant or support worker may deliver practice activities planned by a therapist and support sessions, under the therapist’s direction. Assessment, diagnosis of communication and swallowing difficulties, and planning therapy remain the therapist’s responsibility.

In short: the speech and language therapist is the specialist in communication and swallowing themselves — how they are assessed, how they can be developed or rehabilitated, and how the people around the person can help.

Online therapy

Many therapists now offer appointments by video call as well as in person. Online therapy can work well for conversation-based work, language therapy, voice and fluency support, parent coaching and reviews, and it removes travel from the equation — helpful for families in rural areas, people with limited mobility, and anyone fitting appointments around work or school. Some things, however, are better assessed in person: swallowing assessment in particular usually needs the therapist to be in the room, and very young children vary in how they engage with a screen. A therapist should advise honestly on whether online sessions are suitable for a particular person and goal, and many services mix the two — an in-person assessment, for example, followed by online therapy sessions.

When to seek help

You do not need to be certain something is wrong before seeking advice. It is worth contacting a speech and language therapist, or asking your doctor or child’s school about a referral, if:

• You are worried about any aspect of a child’s talking, understanding, speech sounds, stammering, social communication or feeding — at any age.
• An adult’s communication has changed after a stroke, brain injury or illness, or is changing gradually.
• Speech has become harder for others to understand, or conversation has become noticeably more effortful.
• The voice has become hoarse, weak or strained and has not recovered after a few weeks.
• Eating or drinking has become slow, effortful or frightening, or there is coughing during meals, a wet-sounding voice after swallowing, or repeated chest infections.
• Difficulties with communication are affecting education, work, relationships or confidence — whatever the cause.

One situation is different, and it is an emergency. Sudden speech loss or sudden difficulty speaking, a drooped face, weakness in an arm, or sudden confusion can be signs of a stroke, and choking or difficulty breathing is an emergency too. If you notice any of these, call your local emergency number immediately — do not wait for a therapy appointment. For general information about communication and swallowing difficulties, you can also visit the American Speech-Language-Hearing Association (ASHA) or the International Association of Communication Sciences and Disorders (IALP), or follow your national health authority’s guidance.

Questions to ask a therapist

If you are arranging an assessment or starting therapy, these questions can help you feel prepared and make the most of the first conversation:

1. What will the assessment involve, and how long is it likely to take?
2. What did the assessment show — what are the strengths, and where are the difficulties?
3. What goals would you suggest we work on first, and how do they connect to everyday life?
4. What will therapy sessions look like, and what can we do at home between sessions?
5. How will we know whether therapy is helping, and when will we review the plan?
6. Is there anything we should watch for, or any situation in which we should seek help sooner?

Frequently asked questions

Related guides

• Support for children and parents: the For Kids and Parents hub
• Support for adults: the For Adults hub
• Speech and language therapy services
• How to find a speech and language therapist: a step-by-step guide
• Preparing for your first speech therapy appointment: a checklist

A gentle next step

Understanding what a speech and language therapist does is often the moment things start to feel clearer — whether you are a parent wondering about a child’s talking, or an adult whose communication or swallowing has changed. If you would like to talk about what an assessment involves and what support might help you or your child, you are very welcome to get in touch online. There is no obligation and no pressure: just a friendly first conversation, at your pace.

By Hamayal Adnan, Speech-Language Pathologist

This article is for general educational purposes only and is not medical advice. It does not replace an assessment by a qualified speech and language therapist or other healthcare professional. Every person is different. If you have concerns about speech, language, feeding or swallowing, please seek professional advice. In an emergency, call your local emergency number.