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What is Heat syncope and explain in detail?
Heat syncope is fainting or dizziness as a result of overheating (syncope is the medical term for fainting).  It is a type of heat illness. The basic symptom of heat syncope is fainting, with or without mental confusion. Heat syncope is caused by peripheral vessel dilation, resulting in diminished blood flow to the brain and dehydration.

Signs and symptoms
Faintness, dizziness, headache, increased pulse, restlessness, nausea, vomiting, pale/clammy skin, and brief loss of consciousness.

Causes
Heat syncope occurs in a warm environment when blood pressure is lowered as the body dilates (widens) arterioles (small blood vessels) in the skin to radiate heat. This condition occurs within five days of heat acclimatization, before the blood volume expands.  The result is less blood to the brain, causing light-headedness and fainting when a person stands up quickly or stands for a long period of time