More than 31 million Americans suffer from arthritis. There are two common types of arthritis, rheumatoid arthritis and osteoarthritis, but both affect the joints, causing pain and swelling, and limiting movement.
Rheumatoid arthritis is caused by the malfunctioning of the sufferer's immune system. Instead of fighting off intruders such as bacteria or viruses, the body attacks the synovial membranes, which facilitate the movement of joints, eventually destroying cartilage and eroding bones. Rheumatoid arthritis is most common among the aged, whose immune systems are no longer as robust or efficient.
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Source: http://www.medical-marijuana-testimonials.org/arthritis-and-medical-mari...