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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
There are more sensory neurons in the tongue than in any other part of the body.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.