Polyarthritis

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Overview

Polyarthritis is any type of arthritis which involves five or more joints - an inflammation of two, three or four joints is an oligoarthritis.

Causes

Polyarthritis is most often caused by an auto-immune disorder such as Rheumatoid arthritis, Psoriatic arthritis, and Lupus erythematosus but can also be caused by infections such as Ross River Virus.

Differential Diagnosis of Polyarthritis

Diseases			Clinical manifestations								Para-clinical findings									Gold standard	Additional findings
			Symptoms					Physical examination
											Lab Findings				Imaging				Histopathology
			Joint Swelling	Fever	Weight loss	Numbness	Claudication	Paresthesia	Warm joint	Morning stiffness	Biomarker	CBC	ESR	Other	X-ray	CT scan	Synovial fluid	Other
Polyarthritis	Infectious arthritis	Lyme disease
		Bacterial endocarditis
	Postinfectious (reactive) arthritis	Rheumatic fever
		Reactive arthritis
		Enteric infection
	Other seronegative spondyloarthritides	Ankylosing spondylitis
		Psoriatic arthritis
		Inflammatory bowel disease
	Rheumatoid arthritis
	Inflammatory osteoarthritis
	Crystal-induced arthritis
	Systemic rheumatic illnesses	Systemic lupus erythematosus
		Systemic vasculitis
		Systemic sclerosis
		Polymyositis/dermatomyositis
		Still's disease
		Behçet's syndrome
		Relapsing polychondritis
		Autoinflammatory disorders
	Other systemic illnesses	Sarcoidosis
		Palindromic rheumatism
		Familial Mediterranean fever
		Malignancy
		Hyperlipoproteinemias
Polyarticular pain	Viral arthritis	Hepatitis B and C
		Rubella
		Parvovirus
	Fibromyalgia
	Soft tissue abnormalities
	Hypothyroidism
	Neuropathic pain
	Metabolic bone disease
	Depression