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Many of these diseases are genetic. Sometimes the cause is a medical condition such as alcoholism, a tumor, or a stroke. Other causes may include toxins, chemicals, and viruses. Sometimes the cause is not known. Degenerative nerve diseases include. 1  Alzheimer's disease. 2  Amyotrophic lateral sclerosis.
The general category for the degenerative diseases of the brain is known as dementia. Alzheimer's Dâ¦isease account for about two thirds of all dementias. There is also vascular dementia, dementia due to Parkinson's Disease, normal pressure hydrocephalus, Creutzfeldt-Jacob disease, and many others.