What Is Aphasia?

Medically Reviewed by Neha Pathak, MD on April 01, 2022

What Is Aphasia?


Aphasia is a communication disorder that makes it hard to use words. It can affect your speech, writing, and ability to understand language. Aphasia results from damage or injury to language parts of the brain. It's more common in older adults, particularly those who have had a stroke.

Aphasia gets in the way of a person's ability to communicate, but it doesn’t impair intelligence. People who have aphasia may have a hard time speaking and finding the "right" words to complete their thoughts. They may also have problems understanding conversation, reading and comprehending written words, writing words, and using numbers. People with aphasia may also repeat words or phrases. 

Symptoms of Aphasia

The main symptoms of aphasia include:

  • Trouble speaking
  • Struggling with finding the right term or word
  • Using strange or wrong words in conversation
  • Trouble understanding what other people say or following conversations
  • Writing sentences that don’t make sense or trouble expressing yourself in writing
  • Speaking in short sentences or phrases
  • Using unrecognizable words

Aphasia may be mild or severe. With mild aphasia, the person may be able to converse, yet have trouble finding the right word or understanding complex conversations. Serious aphasia makes the person less able to communicate. The person may say little and may not take part in or understand any conversation. 

Some people with aphasia have problems understanding what others are saying. The problems occur particularly when the person is tired or in a crowded or loud environment. Aphasia does not affect thinking skills. But the person may have problems understanding written material and a hard time with handwriting. Some people have trouble using numbers or even doing simple calculations.

Types of Aphasia

There are different types of aphasia. Each can cause language issues that range from mild to serious. But the verbal expressions can mostly be categorized as fluent or nonfluent aphasia.

Fluent vs. nonfluent aphasia

Fluent aphasia. You may be able to produce speech that contains connected sentences. But the sentences, while linked, may lack proper meaning.

Nonfluent aphasia. With this type, your speech may have halts. You may need a lot of effort to string a sentence together, and it may not be grammatically correct. But you may still be able to preserve the meaning of the words enough to get the point across.

Common types of fluent aphasia include:

Anomic aphasia. With anomic aphasia, you have a hard time finding words. This is called anomia. Because of the difficulties, you may struggle to find the right words for speaking and writing.

Conduction aphasia. This is also called associative aphasia. It’s a form where you may have trouble finding words or repeating phrases.

Transcortical sensory aphasia. With this type, you’re fairly good at repeating words and phrases. But you’re more likely to repeat questions that someone may ask you rather than answer them. This phenomenon is called echolalia.

Wernicke’s aphasia. It’s also known as receptive aphasia. You can hear a voice or read print but may not understand the meaning of the message. Often, someone with receptive aphasia takes language literally. Their own speech may be disturbed because they do not understand their own language.

The common types of nonfluent aphasia are:

Broca’s aphasia. This is also called expressive aphasia. If you have this this pattern, you know what you want to say, but you’ll have a hard time communicating it to others. It doesn't matter whether you’re trying to say or write what you’re trying to communicate.

Global aphasia. This is the most severe type of aphasia. It is often seen right after someone has a stroke. With global aphasia, you have a hard time speaking and understanding words. You also can’t read or write. With a stroke, aphasia may improve with proper therapy.

Transcortical motor aphasia. You may have strong repetition skills, but you may find it hard to answer questions without having to give them a lot of thought.

Exceptional aphasias

These types usually don’t fit well under fluent or nonfluent aphasia. They can include:

Crossed aphasia. You may get this type of aphasia after you have an injury to the brain that controls the dominant side of your body. But it happens on the opposite side. For example, if you’re right-handed, usually the left hemisphere is dominant. But in this case, a stroke in the right hemisphere causes language problems in right-handed people.

Subcortical aphasia. This type of aphasia may develop if you’ve injured the subcortical region of the brain.  

Primary progressive aphasia. Primary progressive aphasia is actually a type of dementia. It’s a rare disorder where people slowly lose their ability to talk, read, write, and comprehend what they hear in conversation over a period of time. There’s no treatment to reverse primary progressive aphasia. People with primary progressive aphasia are able to communicate in ways other than speech. For instance, they might use gestures. And many benefit from a combination of speech therapy and medications.

Causes of Aphasia

Aphasia is usually caused by a stroke or brain injury with damage to one or more parts of the brain that deal with language. According to the National Aphasia Association, about 25% to 40% of people who survive a stroke get aphasia.

Besides a stroke, other causes include:

In some cases, aphasia is a symptom of epilepsy or another neurological disorder. As of today, experts aren’t sure if aphasia can cause you to completely lose language structure, or if it only affects your ability to access language and use it.

Diagnosing Aphasia

Usually, a doctor first diagnoses aphasia when treating you for a stroke, brain injury, or tumor. Using a series of neurological tests, the doctor may ask you questions. The doctor may also issue specific commands and ask you to name items or objects. The results of these tests help the doctor determine if you have aphasia. They also help find out how severe the aphasia is.

Imaging tests used to diagnose aphasia include:

  • CT scan
  • MRI
  • PET scan

If the doctor suspects aphasia, they may also refer you to a speech-language pathologist for a detailed exam. These medical professionals are trained to identify and improve language and communications skills.

During the exam, they may test to observe language skills such as:

  • Grammar
  • Ability to form sounds and letters
  • Ability to understand words and sentences
  • Object knowledge
  • Describing pictures
  • Using single words to name objects and pictures
  • Matching spoken words to pictures
  • Answering yes-or-no questions
  • Following directions


Treatment for Aphasia

Treatment for someone with aphasia depends on things such as:

  • Age
  • Cause of brain injury
  • Type of aphasia
  • Position and size of the brain lesion

For instance, a person with aphasia may have a brain tumor that's affecting the language center of the brain. Surgery to treat the brain tumor may also improve the aphasia.

A person with aphasia who has had a stroke may benefit from sessions with a speech-language pathologist. The therapist will meet regularly with the person to help them speak and communicate better. The therapist will also teach the person ways to communicate that don't involve speech. This will help the person compensate for language difficulties.

Here are some tips from the National Stroke Association for someone with aphasia:

  • Use props to help get the message across.
  • Draw words or pictures on paper when trying to communicate.
  • Speak slowly, and stay calm when talking.
  • Carry a card to let strangers know you have aphasia and what aphasia means.

Speech and language therapy. If you have aphasia and have had a stroke, you may benefit from sessions with a speech-language pathologist. It’s best to start as early as possible. The therapist will meet regularly with you to help you speak and communicate better. The therapist will also teach you ways to communicate that don't involve speech. This will help you compensate for language problems.

This type of therapy may also be done in group settings to start and practice conversations. The interaction may also help you relearn and correct mispronunciations. Therapy may also involve computer and tech devices to relearn words and phrases.

Nonverbal communication therapies. If aphasia limits how well you communicate properly using words and phrases, you may benefit from nonverbal communication therapy.

Your treatment plan may include:

  • A picture-based communication system.
  • Using a communication book to draw
  • A drawing program
  • Working on using gestures
  • Working directly to improve function in areas that affect verbal communication

Medication. Certain drugs may help improve blood flow to the brain that can help it recover or replace some of the chemicals that may have been reduced after aphasia. Drugs like memantine (Namenda) and piracetam have shown some success in small studies. But more research needs to be done before they can be recommended for treatment.

Group therapy. This can be helpful for both someone affected by aphasia and their loved one. Licensed professionals can help you build tools to communicate well and adjust expectations through the recovery process.

Other treatments. Experts are studying brain simulation treatments like transcranial magnetic stimulation and transcranial direct current stimulation. These are noninvasive options that work to stimulate damaged brain cells. But more research needs to be done.

What’s the Outlook for People With Aphasia?

The outlook for people with aphasia may depend on several things, such as:

  • Cause of brain injury
  • Extent of injury
  • Area of injury
  • Age
  • Health

If a stroke caused your aphasia, you’re likely to recover language skills within hours or days. For others, language problems may be a lifelong issue. And the aphasia may range from mild and subtle to really bad.

If a neurodegenerative condition like dementia was the cause of aphasia, you may lose language skills over time.

Complications of Aphasia

Possible complications depend on the cause of the aphasia. This may include:

  • Depression
  • Loss of mobility
  • Loss of bladder or bowel control
  • Higher risk of infection
  • Pressure ulcers
  • Untreated pain


Aphasia vs. Dysphasia

Aphasia is used to describe the total loss of language and speech from a brain injury. Dysphasia refers to the partial loss of language. But the term “aphasia” is usually used to refer to both conditions.

Aphasia vs. Dysarthria

Unlike aphasia that happens because of a brain injury, dysarthria is a speech disorder. It may happen if the muscles used to speak become weak, injured, or paralyzed. Causes can include damage to the nervous system or neuromuscular conditions like ALS or Lou Gehrig’s disease, cerebral palsy, or multiple sclerosis.

Tips for Communicating for People With Aphasia

If you have aphasia, there are things you can do to improve your communication with others. You can:

  • Make gestures with your hands.
  • Use facial expressions.
  • Try using devices like a phone, computer, or communication apps for a video call.
  • Use communication aids like pictures.
  • Pantomime or act it out.
  • Combine reading, writing, and speaking to drive the point home.
  • Point to keywords.


Tips for Communicating With Someone Who Has Aphasia

If someone you know has aphasia, these tips can help you communicate better:

  • Get their attention before you say something.
  • Keep eye contact.
  • Pay attention to their body language.
  • Talk where it’s quiet.
  • Use simple words, but don’t use childish language.
  • Use shorter sentences and repeat important words.
  • Talk slowly.
  • Give them time to say something.
  • Try drawings, gestures, writing, or facial expressions if words aren’t working.
  • Ask them to draw, write, or point if they are having trouble.
  • Ask yes-or-no questions.
  • Let them make mistakes and try.
  • Don’t talk louder. People with aphasia hear normally.
  • Don’t finish their thoughts for them.


When to See a Doctor

Aphasia can often be a sign of a serious medical problem like a stroke. Tell your doctor right away If you notice that you suddenly have issues like:

  • A hard time speaking
  • Trouble understanding speech
  • Unable or finding it hard to recall words
  • Problems with reading or writing

If it’s a medical emergency, call 911 or head to the nearest hospital.

Show Sources


American Stroke Association: "Aphasia vs. Apraxia."

National Stroke Association: "Aphasia."

National Institute on Deafness and Other Communicative Disorders: "Aphasia."

The National Aphasia Association: "Understanding Primary Progressive Aphasia."

Mayo Clinic: “Aphasia.”

American Speech-Language-Hearing Association: “Aphasia,” “Classification of Aphasia.”

Cleveland Clinic: “Aphasia,” “Dysarthria.”

National Aphasia Foundation: “That’s a Fact! Quick Tips for Aphasia-Friendly Communication (Part One).”

StatPearls Publishing: “Aphasia.” “What is the Difference Between Aphasia and Dysphasia?”

Johns Hopkins Medicine: “Aphasia.”

ASHA Leader: “Why Nonverbal Cognition Matters in Aphasia Treatment.”

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