What causes hyperpyrexia?

Common factors that can cause hyperpyrexia are:

- Heatstroke and high environmental temperature

- Malignant hyperthermia

- Neuroleptic malignant syndrome

- Thyroid storm

- Serotonergic syndrome

- Infections by certain microorganisms, such as bacteria, viruses, fungi and parasites

- Drug intoxication, such as amphetamines, ecstasy, cocaine, and phencyclidine

- Withdrawal from medications including sedatives, hypnotics, alcohol, and opiates