Infections: Bacterial infections: Such as pneumonia, urinary tract infections, strep throat, or tuberculosis. Viral infections: Including the flu, common cold, COVID-19, dengue, and HIV. Parasitic infections: Like malaria or toxoplasmosis. Fungal infections: Such as histoplasmosis. Inflammatory Conditions: Autoimmune diseases: Such as lupus, rheumatoid arthritis, or inflammatory bowel disease. Vasculitis: Inflammation of the blood vessels. Heat-Related Illnesses: Heat exhaustion or heatstroke: Due to prolonged exposure to high temperatures. Medications and Drug Reactions: Drug-induced fever: Some medications can cause fever as a side effect. Withdrawal from certain drugs: Can also lead to a fever. Cancer: Certain cancers: Like leukemia or lymphoma, can cause persistent or recurrent fever. Vaccinations: Post-vaccination fever: A mild fever can occur as a normal immune response to some vaccines. Hormonal Disorders: Hyperthyroidism: An overactive thyroid can sometimes cause fever. Im...