Juvenile chronic arthritis occurs when the patient's immune cells, the lymphocytes or T-cells, start to attack the joint cartilage and bone. What triggers the disease is not known, and there is as ...

Frostbite is a skin injury caused by extreme cold ... Without protection, prolonged exposure to intense cold can freeze the water in your body's cells, according to Johns Hopkins Medicine.

Frostbite is a skin injury caused by extreme cold ... Without protection, prolonged exposure to intense cold can freeze the water in your body's cells, according to Johns Hopkins Medicine.