What are the differences between aphasia and dyslexia?

See below: Aphasia is disorder of language (loosely called speech). Dyslexia is problem of writing, reading.

Aphasia: Aphasia is an inability to use language, either receptively, i.e. Understand spoken language, or expressively, i.e. Speak meaningful language. See: http://www.Nlm.Nih.Gov/medlineplus/aphasia.Html dyslexia is a learning disorder, and comes in a number of varieties, e.g. Visual for written language, auditory for spoken, etc. See: http://www.Nlm.Nih.Gov/medlineplus/learningdisorders.Html.