Cholinergic urticaria (heat hives) is a terrible condition in which the body will break out into a tingly, painful, but intensely itchy feeling when the person becomes hot, exercises, gets stressed out, nervous, or if the body temperature rises.ther symptoms of heat hives may include: 1  Red flushing during the breakout (like how your cheeks blush when you get embarrassed) on areas of the body. 2  Small hives or bumps (ranging from the size of tiny mole to the size the pupil of your eye) that may appear on the body.
Specific types of palpitations may be due to structural abnormalities in the heart. Narrowing of the coronary arteries that causes a decreased blood supply to the heart muscle can cause irritability and abnormal heart beats like premature ventricular contractions, ventricular tachycardia, or ventricular fibrillation.
Many things can cause palpitations. You may have these feelings even when your heart is beating normally or somewhat faster than normal. Most palpitations are harmless and often go away on their own.However, some palpitations are signs of a heart problem. Sometimes the cause of palpitations can't be found. If you start having palpitations, see your doctor to have them checked.any things can cause palpitations. You may have these feelings even when your heart is beating normally or somewhat faster than normal. Most palpitations are harmless and often go away on their own.