👉 Osteoarthritis, also known as degenerative joint disease, is a condition that affects the joints of the body. It occurs when the cartilage between the bones in the joints wears away over time, leading to pain and stiffness. The exact cause of osteoarthritis is not fully understood, but it is believed to be caused by inflammation and wear and tear on the joint surface. The symptoms can vary depending on the type and severity of the disease, but some common signs include: