Arthritis is not a single disease, which is is an informal way of referring to joint pain or joint disease.
There are more than 100 types of arthritis and related conditions.
Achilles tendinitis
Achondroplasia
Acromegalic arthropathy
Adhesive capsulitis
Adult onset Still’s disease
Ankylosing spondylitis
Anserine bursitis
Avascular necrosis
Behcet’s syndrome
Bicipital tendinitis
Blount’s disease
Brucellar spondylitis
Bursitis
Calcaneal bursitis
Calcium pyrophosphate dihydrate (CPPD)
Crystal deposition disease
Caplan’s syndrome
Carpal tunnel syndrome
Chondrocalcinosis
Chondromalacia patellae
Chronic synovitis
Chronic recurrent multifocal osteomyelitis
Churg-Strauss syndrome
Cogan’s syndrome
Corticosteroid-induced osteoporosis
Costosternal syndrome
CREST syndrome
Cryoglobulinemia
Degenerative joint disease
Dermatomyositis
Diabetic finger sclerosis
Diffuse idiopathic skeletal hyperostosis (DISH)
Discitis
Discoid lupus erythematosus
Drug-induced lupus
Duchenne’s muscular dystrophy
Dupuytren’s contracture
Ehlers-Danlos syndrome
Enteropathic arthritis
Epicondylitis
Erosive inflammatory osteoarthritis
Exercise-induced compartment syndrome
Fabry’s disease
Familial Mediterranean fever
Farber’s lipogranulomatosis
Felty’s syndrome
Fibromyalgia
Fifth’s disease
Flat feet
Foreign body synovitis
Freiberg’s disease
Fungal arthritis
Gaucher’s disease
Giant cell arteritis
Gonococcal arthritis
Goodpasture’s syndrome
Gout Granulomatous arteritis
Hemarthrosis
Hemochromatosis
Henoch-Schonlein purpura
Hepatitis B surface antigen disease
Hip dysplasia
Hurler syndrome
Hypermobility syndrome
Hypersensitivity vasculitis
Hypertrophic osteoarthropathy
Immune complex disease
Impingement syndrome
Jaccoud’s arthropathy
Juvenile ankylosing spondylitis
Juvenile dermatomyositis
Juvenile rheumatoid arthritis
Kawasaki disease
Kienbock’s disease
Legg-Calve-Perthes disease
Lesch-Nyhan syndrome
Linear scleroderma
Lipoid dermatoarthritis
Lofgren’s syndrome
Lyme disease
Malignant synovioma
Marfan’s syndrome
Medial plica syndrome
Metastatic carcinomatous arthritis
Mixed connective tissue disease (MCTD)
Mixed cryoglobulinemia
Mucopolysaccharidosis
Multicentric reticulohistiocytosis
Multiple epiphyseal dysplasia
Mycoplasmal arthritis
Myofascial pain syndrome
Neonatal lupus
Neuropathic arthropathy
Nodular panniculitis
Ochronosis
Olecranon bursitis
Osgood-Schlatter’s disease
Osteoarthritis
Osteochondromatosis
Osteogenesis imperfecta
Osteomalacia
Osteomyelitis
Osteonecrosis
Osteoporosis
Overlap syndrome
Pachydermoperiostosis Paget’s disease of bone
Palindromic rheumatism
Patellofemoral pain syndrome
Pellegrini-Stieda syndrome
Pigmented villonodular synovitis
Piriformis syndrome
Plantar fasciitis
Polyarteritis nodos
Polymyalgia rheumatica
Polymyositis
Popliteal cysts
Posterior tibial tendinitis
Pott’s disease
Prepatellar bursitis
Prosthetic joint infection
Pseudoxanthoma elasticum
Psoriatic arthritis
Raynaud’s phenomenon
Reactive arthritis/Reiter’s syndrome
Reflex sympathetic dystrophy syndrome
Relapsing polychondritis
Retrocalcaneal bursitis
Rheumatic fever
Rheumatoid arthritis
Rheumatoid vasculitis
Rotator cuff tendinitis
Sacroiliitis
Salmonella osteomyelitis
Sarcoidosis
Saturnine gout
Scheuermann’s osteochondritis
Scleroderma
Septic arthritis
Seronegative arthritis
Shigella arthritis
Shoulder-hand syndrome
Sickle cell arthropathy
Sjogren’s syndrome
Slipped capital femoral epiphysis
Spinal stenosis
Spondylolysis
Staphylococcus arthritis
Stickler syndrome
Subacute cutaneous lupus
Sweet’s syndrome
Sydenham’s chorea
Syphilitic arthritis
Systemic lupus erythematosus (SLE)
Takayasu’s arteritis
Tarsal tunnel syndrome
Tennis elbow
Tietse’s syndrome
Transient osteoporosis
Traumatic arthritis
Trochanteric bursitis
Tuberculosis arthritis
Arthritis of Ulcerative colitis
Undifferentiated connective tissue syndrome (UCTS)
Urticarial vasculitis
Viral arthritis
Wegener’s granulomatosis
Whipple’s disease
Wilson’s disease
Yersinial arthritis
Ref: https://www.disabled-world.com/health/autoimmunediseases/arthritis/arthritis-types.php