Arthritis is a medical condition characterized by inflammation and stiffness in the joints, leading to pain and reduced mobility. There are several types of arthritis, with the most common being osteoarthritis, caused by wear and tear, and rheumatoid arthritis, an autoimmune disorder. Symptoms can range from mild discomfort to severe pain and joint deformity, often worsening with age. Treatment typically involves pain management, physical therapy, and in some cases, medication or surgery.