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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.
Diseases and Conditions. There are more than 100 rheumatic diseases, including degenerative conditions such as osteoarthritis, inflammatory conditions such as rheumatoid arthritis and autoimmune diseases such as lupus.