Arthritis affects one in every seven Americans. It affects people of all ages. It most often begins as a person gets older. Arthritis causes pain, stiffness, and swelling in or around joints. These symptoms can develop suddenly or slowly. Only a doctor can tell if it's arthritis.

The causes of most forms of arthritis are unknown, although we are learning more. People who are overweight have a higher chance of developing arthritis. Excess weight increases the risk for developing osteoarthritis in the knees. This may also apply to the hips and hands. Women are at special risk for this. In men, excess weight increases the risk for developing gout. See a doctor or registered dietitian for help in losing weight.

Joint injuries caused by accidents or overuse increase the risk for some types of arthritis. Certain genes can be inherited that may increase the risk for some types of arthritis. More research is needed to find out how to reduce the risk from these factors.

Stress does not cause arthritis and reducing stress will not cure the disease. It is true, however, that pain from any cause can be made worse by a person's reaction to stressful events or feelings. This normal reaction varies in severity from person to person. It is helpful to learn ways to control stress.

Arthritis is not caused by eating certain foods. However, some foods may irritate existing conditions. A small percentage of people with rheumatoid arthritis experience a flare-up after eating a specific food. Milk is the most common offender.

Nearly 40 million Americans have arthritis. The effects of three major factors on certain types of arthritis are currently being studied. They are inherited genetic factors, what happens during a person's life, and lifestyle. These factors vary for every type of arthritis.

To learn more about how to spot arthritis, what to do, and services available, contact your local Arthritis Foundation chapter or call (800) 283-7800.

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