Lower extremity arthritis pain refers to discomfort and inflammation in the joints of the lower body, including the hips, knees, ankles, and feet, caused by various forms of arthritis, such as osteoarthritis or rheumatoid arthritis. This pain can result from the wear and tear of cartilage, leading to joint degeneration and stiffness. Symptoms may include aching or sharp pain, swelling, decreased range of motion, and increased pain during movement or after periods of inactivity.