Editing Hyperthermia (section)

==Signs and symptoms==
An early stage of hyperthermia can be "heat exhaustion" (or "heat prostration" or "heat stress"), whose symptoms can include heavy sweating, rapid breathing and a fast, weak pulse. If the condition progresses to heat stroke, then hot, dry skin is typical<ref name=Harrisons/> as [[blood vessel]]s dilate in an attempt to increase heat loss. An inability to cool the body through [[perspiration]] may cause [[dry skin]]. Hyperthermia from neurological disease may include [[anhidrosis|little or no sweating]], cardiovascular problems, and confusion or [[delirium]].

Other signs and symptoms vary. Accompanying dehydration can produce [[nausea]], vomiting, [[headaches]], and [[low blood pressure]] and the latter can lead to [[fainting]] or [[dizziness]], especially if the standing position is assumed quickly.

In severe heat stroke, confusion and aggressive behavior may be observed. Heart rate and respiration rate will increase ([[tachycardia]] and [[tachypnea]]) as blood pressure drops and the heart attempts to maintain adequate [[Circulatory system|circulation]]. The decrease in blood pressure can then cause blood vessels to contract reflexively, resulting in a pale or bluish skin color in advanced cases. Young children, in particular, may have [[seizures]]. Eventually, [[organ failure]], [[unconsciousness]] and death will result.