The main sign of heat stroke is a core body temperature greater than 105 degrees Fahrenheit; other symptoms include a throbbing headache, light-headedness, dizziness, lack of perspiration despite the heat, nausea, vomiti... More »

According to WebMD, the trademark sign of a heat stroke is an elevated core body temperature over 105 degrees Fahrenheit. Other symptoms may include a pounding headache, lack of perspiration, muscle weakness, dizziness, ... More »

Possible warning signs of heat stroke include fainting; red, warm and dry skin; absence of sweating in spite of immense heat; and behavioral alterations such as unsteady walking, disorientation or confusion, reports WebM... More »

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Symptoms of heat stroke include dizziness, headache, fatigue, nausea and vomiting according to WebMD. Other signs of heat stroke are flushed skin that is either hot and dry or cold and clammy, a body temperature of 104 d... More »

Fainting is often the first sign of heat stroke, according to WebMD, along with a core body temperature above 105 degrees Fahrenheit. Other possible symptoms include a throbbing headache; dizziness and lightheadedness; r... More »

Symptoms of stroke include sudden confusion, trouble speaking, sudden vision trouble and difficulty walking as well as loss of balance, dizziness and sudden headache with no cause, according to the National Stroke Associ... More »

Symptoms of natural gas poisoning include nausea, fatigue, dizziness, irregular breathing and headache, according to the National Institutes of Health. People can become unconscious or die after high-level natural gas ex... More »