What is Aphasia?

Aphasia is a difficulty using or understanding language, caused by damage to the areas of the brain responsible for processing it — most often after a stroke. It is not a problem of intelligence or general memory: a person with aphasia remains the same person, with the same ideas and capacity for thought, but faces a barrier when trying to express or understand them through language.

This is worth stressing because it's the most common — and most painful — misunderstanding: aphasia does not affect intelligence. The person knows what they want to say; what fails is the "bridge" between thought and word, spoken or written.

Why it happens

• Stroke: by far the most frequent cause, when reduced blood flow or bleeding affects language-related areas in the left hemisphere.
• Traumatic brain injury.
• Brain tumors, when located in those same areas.
• Infections affecting the brain, such as encephalitis.
• Neurodegenerative diseases: there is a progressive form, primary progressive aphasia, in which language deteriorates slowly and gradually, with no prior acute event.

Common forms

No two cases of aphasia are alike, but they tend to fall into general profiles:

• Expressive aphasia (Broca's): difficulty finding words or building sentences, even though understanding what is heard is intact. Speech tends to be slow, effortful, and made up of short sentences.
• Receptive aphasia (Wernicke's): speech may flow smoothly, even quickly, but understanding what others say — or what one's own speech means — is difficult, sometimes with invented or misplaced words the person doesn't notice in the moment.
• Global aphasia: affects both expression and comprehension more severely. Usually occurs with more extensive brain damage.
• Anomic aphasia: the mildest and most common form, where the main difficulty is finding the specific word at the moment of speaking, with the rest of language fairly well preserved. It's different enough to have its own article: What is Anomia?

Each person experiences aphasia differently, and the degree varies greatly from case to case. Beyond speech, aphasia can also affect reading (alexia) and writing (agraphia), since they largely share the same brain circuits as spoken language.

Beyond words: the impact on daily life

Aphasia isn't just a technical language difficulty — it changes how a person relates to everything around them. Everyday things like waiting your turn at a shop, following a group conversation, reading a prescription, or writing a text message can become exhausting.

This carries a real emotional cost: frustration, social isolation, and sometimes anxiety or low mood — not because of the brain injury itself, but because of the communication barrier it creates. Families often, without realizing it, start speaking for the person or avoid asking for their opinion directly — understandable, but something that can end up reinforcing that sense of isolation.

The role of speech therapy

A speech therapist evaluates which specific aspects of language are most affected — expression, comprehension, reading, writing — and designs a plan tailored to that specific profile, not a generic program. The work can include:

• Naming exercises: finding and saying the correct word, with different types of cues or support.
• Auditory and reading comprehension: from simple instructions to longer texts, depending on the starting level.
• Reading and writing, when these have also been affected.
• Alternative communication strategies when verbal language is very limited: gestures, drawings, pointing at a picture board, or apps designed for this purpose.

Therapy also relies heavily on regular practice and the person's close environment, who learn ways of communicating that make exchange easier — language recovery doesn't happen only in therapy sessions, but in every conversation of daily life.

How to help day-to-day if you live with someone with aphasia

• Give them time. Finding the word or building the sentence can take longer than usual; finishing the sentence for them, even with good intentions, doesn't always help.
• Speak normally, not like to a child. Aphasia doesn't affect anyone's intelligence or mental age.
• Simplify the form, not the content. Shorter sentences and one idea at a time do help; talking about simpler or more childish topics does not.
• Use gestures, drawings, or pointing at objects when words don't come — not all communication has to go through speech.
• If the conversation gets stuck, try yes/no questions, or offer closed choices to pick from.
• Keep including the person in family decisions and conversations. Not being able to express themselves fluently doesn't mean not having an opinion.

An important note

This article is for informational and educational purposes only, and does not replace a speech-language or neurological assessment. Every case of aphasia is different, and prognosis and the most suitable therapy should always be assessed by the professionals caring for each person.