The worldwide prevalence of<unk>  is approximately 3%. Rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, and undifferentiated spondyloarthritis are the most common subtypes of<unk> . The diseases occur most commonly in the 30-40 age group.
Inflammatory arthritis
Reactive arthritis
Rheumatoid arthritis
Psoriatic arthritis
Enthesitis
Septic arthritis
Rheumatism
Osteoarthritis