Speech and Language Therapy After Stroke: Aphasia, Dose and Swallowing

Speech and language therapy (SLT) after a stroke treats two distinct problems: communication difficulties, most often aphasia, and swallowing problems, called dysphagia. The same profession covers both, and the swallow is usually assessed first because it is a safety issue. SLT is a core part of the coordinated rehabilitation team, and the language work follows the same principle as the rest of neuro-rehabilitation: task-specific, repetitive practice at a dose high enough to matter¹.

My own stroke took my words before it took anything else, and I want to be honest about how that felt. For the first two days I could think a whole clear sentence and hear it in my head, then open my mouth and get one wrong word, or no word at all. I was not confused. I knew my wife’s name; I simply could not fetch it. That gap, between knowing and saying, is the thing people around you cannot see, and it is the thing this article is really about.

What does speech and language therapy treat after a stroke?

SLT after a stroke treats communication problems (mainly aphasia, and sometimes the motor speech disorders dysarthria and apraxia of speech) and swallowing problems (dysphagia). These are separate difficulties that happen to sit with the same profession, because the brain areas and the muscles involved overlap. The therapist assesses which you have, in what mix, and how severe².

It helps to see where SLT sits. It is one seat at the table alongside physiotherapy, occupational therapy and neuropsychology, and no single therapy works in isolation; you can see the whole line-up in the rehabilitation team. What the speech therapist brings is expertise in language and in the swallow, two things that are easy for a stretched ward to underestimate.

Why is the swallow assessed first?

The swallow is assessed first because an unsafe swallow can let food or drink pass into the airway and lungs, risking aspiration pneumonia, so it is a safety priority rather than a rehabilitation goal. Dysphagia is common after a stroke because the muscles and nerves that shape speech also control swallowing, and swallow screening is one of the first jobs on a stroke unit³.

In practice this means the first person from the SLT service you meet may not be there to work on your words at all. They are there to check you can safely eat and drink, and that can mean thickened fluids or a different diet texture for a while. I remember being frustrated by that, wanting to talk when the priority was whether I could swallow water. It is not a detour; it is what keeps the rest of recovery possible.

What is aphasia, and how common is it?

Aphasia is a loss of language, not a loss of intelligence: it can affect speaking, understanding, reading and writing in any combination, and it affects roughly 25 to 40% of stroke survivors in the early period. It is caused by damage to the language areas of the brain, usually on the left side. The person still knows what they mean; the machinery for expressing it is what has been hit⁴.

That distinction matters more than any other single fact on this page. People spoke slowly and loudly to me, as if the problem were my hearing or my mind, when the problem was purely getting language out and in. If you want the fuller picture of how language returns over time, aphasia recovery goes into the pattern in detail.

How much therapy does aphasia need?

The clearest functional gains from aphasia therapy cluster at a total dose of about 20 to 50 hours, ideally delivered 3 to 5 days a week, while very small amounts of around 5 hours in total have shown no functional benefit. In other words, dose and frequency both matter: occasional short sessions are unlikely to move the needle, and the therapy has to accumulate⁵.

This is the same intensity logic that runs through the whole field, so it is worth reading alongside how much therapy do you need. It is also where reality and provision often part ways: many services cannot fund 3 to 5 sessions a week, which is one reason self-directed and computer-based practice between sessions matters, because it helps the hours add up. What you do not want is to mistake a handful of hours for a proper course of therapy.

When does speech recover, and by how much?

Recovery from aphasia is steepest in the first 3 months and continues more slowly after that, and it is far more complete when the initial aphasia was mild. Severe aphasia can still improve, but more slowly and less completely, and the early window is not the only window: measured gains fall over time but do not stop⁴.

The honest version is that nobody could tell me on week one how much I would get back, because it genuinely depends on how much was lost. My words came back unevenly, names last of all, over months rather than days. If you have been told the door shuts at six months, read the recovery plateau myth; the plateau is partly an artefact of when therapy is withdrawn, not a hard biological ceiling³.

How is aphasia therapy actually done?

Aphasia therapy is task-specific and repetitive: it works on the specific things you struggle with, whether that is finding words, understanding, reading or writing, with enough repetition to drive change. The therapist tailors the tasks to your pattern of difficulty, and much of the work is practising communication in ways that matter to your daily life, not just naming pictures¹.

This is the same task-specific principle that underpins task-specific training for the arm and leg, and it rests on the same biology explained in how neuroplasticity drives recovery: the brain reorganises through use. For me the turning point was practising the sentences I actually needed, ordering a coffee, answering the phone, rather than abstract drills. Real words for real situations stuck when nothing else would.