Many rheumatic disorders of chronic, intermittent pain (including joint pain, neck pain or back pain) have historically been caused by infectious diseases. Their etiology was unknown until the 20th century and not treatable. Postinfectious arthritis, also known as reactive arthritis, and rheumatic fever are other examples. Major rheumatic disorders can be divided into 10 major categories based on the nomenclature and classification proposed by the American College of Rheumatology (ACR) in 1983, and they are: * Diffuse connective tissue diseases * Rheumatoid arthritis * Juvenile arthritis * Systemic lupus erythematosus * Sjögren syndrome * Scleroderma * Polymyositis * Dermatomyositis * Behçet's disease * Relapsing polychondritis * Arthritis associated with spondylitis (i.e., spondarthritis) * Ankylosing spondylitis * Reactive arthritis * Psoriatic arthritis * Osteoarthritis (i.c., osteoarthrosis, degenerative joint disease) * Rheumatic syndromes associated with infectious agents (direct and indirect or reactive) * Metabolic and endocrine diseases associated with rheumatic states * Gout, pseudogout * Neoplasms * Neurovascular disorders * Bone and cartilage disorders * Extraarticular disorders * Bursitis/Tendinitis of the shoulder, wrist, biceps, leg, knee cap (patella), ankle, hip, and Achilles tendon * Capsulitis * Miscellaneous disorders associated with articular manifestations * Palindromic<unk>  has been theorized to be a form of rheumatoid arthritis.
Rheumatism
Tietze syndrome  Tietze syndrome  1
Rheumatoid arthritis
Lupus erythematosus
Oligoarthritis
Reactive arthritis
Enthesitis
Inflammatory arthritis