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Body temperatures above 40°C (104 °F) are life-threatening. This compares to normal human body temperature of 36-37°C (97-98°F). At 41°C (106 °F), brain death begins, and at 45°C (113°F) death is nearly certain. Internal temperatures above 50°C (122°F) will cause rigidity in the muscles and certain, immediate death.

Victims may become confused, may become hostile, often experience headache, and may seem intoxicated. Blood pressure may drop significantly from dehydration, leading to possible fainting or dizziness, especially if the victim stands suddenly. Heart rate and respiration rate will increase (tachycardia and tachypnea) as blood pressure drops and the heart attempts to supply enough oxygen to the body. The skin will become red as blood vessels dilate in an attempt to increase heat dissipation. The decrease in blood pressure will cause blood vessels to contract as heat stroke progresses, resulting in a pale or bluish skin color. Complaints of feeling hot may be followed by chills and trembling, as is the case in fever. Some victims, especially young children, may suffer convulsions. Acute dehydration such as that accompanying heat stroke can produce nausea and vomiting; temporary blindness may also be observed. Eventually, as body organs begin to fail, unconsciousness and coma will result.

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Yes you can faint from having a high fever. If the brain gets to warm it begins to kill off cells and therefore telling your body to shut down to help. If someone is about to pass out from high fever take them to the ER immediately.

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11y ago
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Q: Will you pass out if you have a high enough fever?
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