Infections:

• Viral infections (e.g., influenza, common cold, COVID-19)
• Bacterial infections (e.g., urinary tract infection, pneumonia, cellulitis)
• Fungal infections (e.g., candidiasis, aspergillosis, histoplasmosis)
• Parasitic infections (e.g., malaria, toxoplasmosis)
• Tuberculosis
• Infective endocarditis
• Central line-associated bloodstream infection

Inflammatory Conditions:

• Rheumatoid arthritis
• Systemic lupus erythematosus (SLE)
• Inflammatory bowel disease (e.g., Crohn's disease, ulcerative colitis)
• Temporal arteritis
• Polymyalgia rheumatica

Gastrointestinal Disorders:

• Inflammatory bowel disease (Crohn's disease, ulcerative colitis)
• Hepatitis
• Liver abscess

Autoimmune Diseases:

• Systemic infections (e.g., Kawasaki disease)
• Juvenile idiopathic arthritis
• Vasculitis (e.g., granulomatosis with polyangiitis, microscopic polyangiitis)

Endocrine Disorders:

• Thyroiditis (e.g., Hashimoto's thyroiditis)
• Adrenal insufficiency (Addison's disease)
• Hyperthyroidism

Cardiovascular Disorders:

• Endocarditis
• Deep vein thrombosis (DVT) and pulmonary embolism (PE)

Neoplastic Conditions:

• Lymphoma
• Leukemia
• Solid tumors (e.g., lung cancer, kidney cancer)
• Metastatic disease

Medications and Toxins:

• Drug-induced fever (e.g., antibiotics, anticonvulsants)
• Toxin exposure (e.g., heavy metals, snake bites)

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• Neurological Conditions:

  • Meningitis
  • Encephalitis
  • Brain abscess

Respiratory Conditions:

• Tuberculosis
• Aspiration pneumonia
• Lung abscess

1. Heat-Related Illnesses:

   • Heat exhaustion
   • Heat stroke

Hematologic Disorders:

• Hemolytic anemia
• Thrombocytopenia

Renal Disorders:

• Pyelonephritis
• Glomerulonephritis

Metabolic Conditions:

• Hyperthermia due to metabolic dysfunction

Hematological Disorders:

• Hemolytic anemias
• Thrombocytopenias

Autoinflammatory Syndromes:

• Familial Mediterranean fever (FMF)
• Periodic fever syndromes

Postoperative Fever:

• Fever after surgery may be due to surgical site infection.

Psychogenic Fever:

• Fever without a clear medical cause may sometimes be related to psychological factors.