The characteristic symptoms and signs of gout are sudden onset of joint pain, joint swelling, heat in the affected area, and joint redness. These symptoms and signs usually affect a single joint. The pain is typically severe, reflecting the severity of inflammation in the joint. The affected joint is often very sensitive to touch to the point that some people with gout attacks experience pain from something as simple as pulling the bedsheets over the inflamed joint. The affected joint becomes swollen. Gout frequently involves joints in the lower extremities. The classic location for gout to occur is the big toe (first metatarsophalangeal joint). Gout can also affect the foot, knee, ankle, elbow, wrist, hands, or nearly any joint in the body. When gout is more severe or longstanding, multiple joints may be affected at the same time. This causes pain and joint stiffness in multiple joints. Another sign of gout is the presence of tophi. A tophus is a hard nodule of uric acid that deposits under the skin. Tophi can be found in various locations in the body, commonly on the elbows, upper ear cartilage, and on the surface of other joints. When a tophus is present, it indicates that the body is substantially overloaded with uric acid. When tophi are present, the uric acid level in the bloodstream typically has been high for years. The presence of tophi indicates tophaceous gout and treatment with medications is necessary.