Osteoarthritis is the most common type of arthritis. It involves the breakdown of cartilage and bone growth in joints like the knees and hips. Symptoms include joint pain and stiffness that worsens with age, obesity, injury, and lack of exercise. Treatment focuses on weight loss, physical therapy, medications, and sometimes joint replacement. Gout is caused by high levels of uric acid in the blood which can form painful crystals in joints like the toes. It causes sudden, severe attacks of red, swollen, and hot joints. Risk factors include diet, obesity, and family history. Treatment involves medications to reduce inflammation and prevent future attacks. Tendonitis and bursitis involve inflammation of tendons