Osteoarthritis is the most common type of arthritis, affecting over 30 million people in the United States.

Osteoarthritis is caused by the breakdown of cartilage, the tissue that cushions the ends of bones. This breakdown can be caused by wear and tear, injury, or other factors.

The symptoms of osteoarthritis can include joint pain, stiffness, swelling, and decreased range of motion.

Rheumatoid arthritis is the most common type of inflammatory arthritis, affecting over 1.5 million people in the United States.

Rheumatoid arthritis is caused by an autoimmune dysfunction, in which the body's immune system attacks its own tissues. This can lead to inflammation and damage to the joints.

The symptoms of rheumatoid arthritis can include joint pain, stiffness, swelling, and decreased range of motion. These symptoms can also be accompanied by fatigue, weight loss, and fever.

Primary gout is the most common type of gout, accounting for about 90% of cases. It is caused by a buildup of uric acid in the blood, which can lead to the formation of crystals in the joints.

Gout is caused by high levels of uric acid in the blood. This can be caused by a number of factors, including diet, genetics, and certain medical conditions.

The symptoms of gout can include sudden, severe joint pain, swelling, redness, and tenderness. These symptoms can last for a few days or weeks.

Lumbar strain is the most common type of back pain, accounting for about 80% of cases. It is caused by a tear in the muscles or ligaments of the lower back.

Lumbar strain can be caused by a number of factors, including lifting heavy objects, poor posture, repetitive motions, and sudden movements.

The symptoms of lumbar strain can include lower back pain, stiffness, muscle spasms, and decreased range of motion.

Cervical strain is the most common type of neck pain, accounting for about 80% of cases. It is caused by a tear in the muscles or ligaments of the neck.

Cervical strain can be caused by a number of factors, including poor posture, repetitive motions, sudden movements, and trauma.

The symptoms of cervical strain can include neck pain, stiffness, headaches, and decreased range of motion.