What causes a fever?
Fever is the result of an immune response by your body to a foreign invader. These foreign invaders include viruses, bacteria, fungi, drugs, or other toxins.
These foreign invaders are considered fever-producing substances (called pyrogens), which trigger the body's immune response. Pyrogens tell the hypothalamus to increase the temperature set point in order to help the body fight off the infection.
Fever is a common symptom of most infections. In children, immunizations orteething in may cause low-grade fever. Autoimmune disorders, medication reactions, seizures, or cancer may also cause fevers.
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