What are causes of pyrexia?

Infectious causes

* Bacterial infections, such as pneumonia, urinary tract infections, and sepsis

* Viral infections, such as influenza, the common cold, and measles

* Fungal infections, such as candidiasis and aspergillosis

* Parasitic infections, such as malaria and toxoplasmosis

Non-infectious causes

* Autoimmune disorders, such as rheumatoid arthritis and lupus

* Cancers, such as leukemia and lymphoma

* Medications, such as antibiotics and chemotherapy drugs

* Heat stroke

* Dehydration

* Hyperthyroidism

* Addison's disease