Bursitis is the painful inflammation or irritation of some bags, called bursae, which are located in places where there are points of friction, such as muscles, tendons or bones. The function of these bags is to help the normal motion of joints and avoid friction between them. Bursitis is manifested, among other places, on the shoulders (shoulder bursitis), knees, hips, pelvis, elbows, toes and heels. The causes of bursitis may be the overuse of a joint injury, rheumatoid arthritis, gout or infection. The symptoms of bursitis include pain and inability to perform certain exercises or unusual movements in daily life. It can appear suddenly or gradually, something the patient feels the movement and touch, as the skin around the bursa is more sensitive. There are two types of bursitis: acute or chronic. In acute, the affected joint turn red and feel has a temperature above the rest of the body. It is painful and is usually caused by an infection or gout. In chronic, there is swelling and pain and reduces the normal movement, causing muscle atrophy and motor weakness. In most cases bursitis disappears without any specific treatment.