Arthritis is inflammation of a joint connecting two bones such as the fingers, wrists, hips, back, and knee joints. People suffering from arthritis often complain of pain in the affected joint, which is commonly accompanied by redness, a sensation of heat, and minor swelling.
Arthritis typically develops gradually over many years. Initially, it presents as an occasional mild ache in the joints which progresses into chronic pains, stiffness, and swelling. The arthritis sufferer begins to avoid certain painful movements so as to guard against the pain, resulting in further stiffness, limited range of motion, and decreased mobility.
Arthritis has become the leading cause of disability in the U.S., with more than 46 million people suffering various forms of physical difficulties.