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.
Yet panic attacks and anxiety themselves do not account for all of the palpitations. 1  That's because palpitations may also occur for reasons unrelated to anxiety, but still affected by anxiety. For example: 2  Caffeine Caffeine is known to cause heart palpitations. It's likely that those with anxiety are either more prone to these palpitations, or more prone to noticing them and thus amplifying their effects. Alcohol and Nicotine Both alcohol and nicotine may also cause heart palpitations.