- Osteoarthritis (OA): The most common form, caused by wear-and-tear of cartilage in the joints, typically affecting the knees, hips, hands, and spine
- Rheumatoid Arthritis (RA): An autoimmune condition where the immune system attacks the joints, causing inflammation, pain, and joint damage
- Psoriatic Arthritis: Arthritis associated with the skin condition psoriasis
- Gout: A form of arthritis caused by a buildup of uric acid crystals in the joints, often affecting the big toe