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.
Palpitation Causes. The heart needs its normal environment to work well. This is especially true for the heart's electrical system; changes in electrical conduction may lead to a decreased ability for the heart to pump blood. From within the body, abnormal levels of electrolytes like potassium, magnesium, and calcium can cause palpitations.
Palpitations: Symptoms, types, causes, diagnosis, treatment. Palpitations is the feeling that happens when someone feels an abnormality in the normal beating of the heart. These palpitations can be an isolated extra beat, or they can run together and last for prolonged periods of time. Each part of the heart has the potential to be irritable and cause an extra beat to occur. As well, short circuits in the electrical conduction system of the heart can cause runs of abnormal firing.