Arthritis is very common but isn’t well understood. Actually, “arthritis” is not a single disease; it is an informal way of referring to joint pain or joint disease. There are more than 100 different types of arthritis and related conditions.
Arthritis can be caused by the natural aging process, a gradual wearing away of the tissues surrounding the joints, environmental and genetic factors (rheumatoid arthritis), high levels of uric acid, nutrient deficiency, low bone mineral density, or various viral and bacterial infections. Most commonly characterized by pain and swelling in the joints of the hands, arms, and legs, this group of conditions is the leading cause of disability in most parts of the world. Symptoms typically include pain and inflammation, reduced range of motion, difficulty walking or using your hands, stiffness and permanent changes to the physical appearance of the joints.

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Further reading about arthritis here
http://naturalremedylab.com/natural-remedies-for-arthritis/