Infections
Pulmonary (e.g Tuberculosis), G.I. (e.g. cholangitis, etc), urinary (e.g. UTI, etc), sinusitis, skin, meningitis, bone, infectious mononucleosis, Lyme, cytomegalovirus, Epstein-Barr virus, HIV, mastitis, West Nile, endocarditis, leptospirosis, hepatitis, osteomyelitis, occult abscess (intra-abdominal, dental, brain), systemic mycosis, toxoplasmosis, brucellosis, Q fever, cat-scratch disease, salmonellosis, malaria
Necrotizing fasciitis
Toxic shock syndrome
Whipple’s disease

Neoplasm
Lymphoma, leukemia, renal cell carcinoma, primary or metastatic liver cancer, atrial myxoma, tumor lysis syndrome, others
Brain tumor

Vascular and hematologic
Myocardial infarction; Recurrent Pulmonary embolus, deep vein thrombosis;
Transfusion reaction
Stroke, subarachnoid hemorrhage, intracranial hemorrhage
Bowel ischemia, infarction

Autoimmune/Inflammatory
Autoimmune: Adult Still’s disease, systemic lupus erythematosus, Sarcoidosis, cryoglobulinemia, temporal (giant cell) arteritis, polymyalgia rheumatica, Wegener’s granulomatosis, Polyarteritis nodosa,  Crohn’s disease
Inflammatory: Ulcerative colitis

Drugs, etc
Use: antibiotics, heparin, phenytoin, etc.
Withdrawal: e.g. alcohol, opiates, barbiturates, benzodiazepines

Endocrine: 
Hyperthyroidism; thyroiditis

Other
Surgical site inflammation (seroma, hematoma)
Head trauma
Serotonin syndrome
Neuroleptic malignant syndrome
Heat stroke
Malignant hyperthermia,
Gout,
Pancreatitis,
Periodic fever with aphthous stomatitis(PFAPA),
Pharyngitis and adenitis,
Familial Mediterranean Fever,
Alcoholic or granulomatous hepatitis,
Hematoma,
Hypersensitivity pneumonitis,
Factitious

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