Pain: is an unpleasant sensation and emotional experience that is associated with tissue damage. It allows the body to react and prevent further tissue damage. Pain can be short-term (acute) or long-term (chronic). Perception of pain can differ from person to person, from tolerable to non-tolerable.
Osteoarthritis: Osteoarthritis is a chronic (lifelong) joint condition in which the Glucosamine sulfate (a chemical found in the human body, especially in joints) gets reduced. This fluid is used by the body to produce other chemicals required to make ligaments, cartilage, tendons, and the thick fluid surrounding joints. When this chemical gets reduced, then the cartilage breaks down and becomes thin, which causes friction between the bones, leading to wear and tear (damage) of the joint tissues, leading to pain, stiffness, inflammation, and reduced locomotion. It causes the bone to rub together, leading to pain, stiffness, and other osteoarthritis symptoms. This disease can occur in any joint, but commonly affected areas of the body are hands, fingertips, knees, hips, and spine, typically at the neck or lower back. The most common symptoms of osteoarthritis include pain, tenderness (discomfort when pressing on the area with fingers), stiffness, and inflammation.
Rheumatoid arthritis (RA): Rheumatoid arthritis (RA) is an autoimmune disease in which the immune cells attack the joints and cause bone erosion, leading to severe pain and swelling. It may lead to joint deformity if left untreated.