Global aphasia is a disorder where a person has trouble understanding words, speaking, reading and writing. Global aphasia is the most severe type of aphasia and occurs because of brain damage. Usually, the brain damage that causes global aphasia is due to a stroke. If the damage is not too bad or severe, the person may be able to recover andlearn to speak again. However, sometimes the brain damage from a stroke is severe and the person will not be able to speak or read again. In some cases, a person may be able to read and understand what others say to them, but are not be able to speak. Different types of therapy are available for people affected by global aphasia. Talk to your doctor to find the best treatment if you or your loved one has been diagnosed with global aphasia.