Aphasia affects your ability to speak and understand what others say. It can also affect your ability to read and write. It happens when you are no longer able to understand or use language. Aphasia is a common problem after a stroke and around one third of stroke survivors has it.
Aphasia is the medical term for full loss of language. Dysphasia is the medical term for partial loss of language. The word aphasia is now commonly used to describe both conditions. Some people may refer to aphasia as dysphasia.