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If you have pain when you are breathing, you may be at immediate risk for a pulmonary embolism if you also have: Pain deep in one

Many prescription and nonprescription medicines can cause dehydration. A few examples are: Antihistamines. Blood pressure

Many things can make the heart beat faster or slower than usual. Some common examples are: Stress. Pain. Illness or fever

Many medicines and drugs can affect the rate and rhythm of the heart. A few examples are: Asthma medicines. Decongestants and cold

Exposure to a hot environment can cause many problems. Problems can be mild, like a heat rash, swelling in the hands or feet, or

Symptoms of heat exhaustion may include: Weakness, dizziness, or fatigue. Headache. Nausea. Skin that is pale, cool, and moist

Some other symptoms of heat-related illness include: Muscle twitching or spasms. Muscles that feel hard and lumpy. Sore muscles.

Signs that heat exhaustion is becoming severe include: Blurred vision. Fast breathing and fast heart rate (more than 120 beats per

If you have symptoms of heat exhaustion, try the following first aid to cool off : Stop what you are doing and rest. Get out of

Many prescription and nonprescription medicines can cause sleep problems. A few examples are: Antidepressants. Cold medicines