Rheumatology is a specialty that focuses on the diagnosis and treatment of diseases of the musculoskeletal system, that is to say, diseases of bones, joints, muscles, tendons and ligaments, but rheumatologists ( physicians specializing in rheumatology) also treat certain neurological devices such as sciatica and above all the collagen vascular diseases, autoimmune diseases which can have many extra-articular manifestations (skin, eye, kidney, lungs, etc..).

These diseases can be classified into families:

* Inflammatory diseases: rheumatoid arthritis, ankylosing spondylitis, lupus erythematosus ... usually an autoimmune disease
* Infectious diseases: Septic arthritis, spondylodiscitis
* Skeletal diseases: osteoarthritis, osteoporosis, ...
* Neoplastic diseases: benign and malignant
* Metabolic disease: gout, chondrocalcinosis ...
* Dysplastic borne disease: genetic disorders of bone ...
* Other diseases affecting the joints, such as the Reflex sympathetic ...

These groups are expressed in disease signs or bone articular joint, there is no "arthritis" but osteoarticular rheumatism or different causes and therefore different prognosis.

* Rheumatoid
* Lupus Erythematosus
* Sjögren's syndrome
* Scleroderma (systemic sclerosis)
* Dermatomyositis
* Polymyositis
* Polymyalgia rheumatica
* Osteoarthritis
* Septic Arthritis
* Gout, pseudogout
* Spondyloarthropathies
o Ankylosing spondylitis
o Reiter's syndrome
o psoriatic arthropathy
o spondylitis enteropathica
o reactive arthropathy
* Vasculitis
o polyarteritis nodosa
o purpura Henoch-Schönlein
o Serum sickness
o Wegener's granulomatosis
o giant cell arteritis
o arteritis
o Takayasu's arteritis
o Behcet's Disease
o Kawasaki disease (mucocutaneous lymph node syndrome)
o Buerger's Disease (thromboangiite obliterans)

See also Lupus Erythematosus disseminated