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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.
1 Primary degenerative dementia of the Alzheimer type, presenile onset, with delirium. 2  Primary degenerative dementia of the Alzheimer type, presenile onset, with depression. 3  Primary degenerative dementia of the Alzheimer type, senile onset, with delusions.  Rett syndrome w dementia w behavioral disturbance.