Why are the ears always red?

There are three symptoms of ear fever.

First, after doing strenuous exercise, you often feel your ears warm. This is because when people exercise, their heart beats faster and more blood is supplied to the muscles of the limbs. After physical exercise, the blood required by the muscles is reduced, but the beating of the heart cannot be slowed down immediately, so more blood flows to the heart. The skin of the head and ears is very thin and filled with abundant blood vessels. When a large amount of blood flows through the ears, the blood vessels expand and become thicker, causing the ears to become red. Because the blood has a certain temperature, the ears will feel warm. After the heart gradually returns to normal, the blood vessels shrink and become thinner, the blood in the ears decreases, and the fever no longer occurs.

The second is that when the outside temperature is low, the blood vessels shrink when exposed to cold, and the face becomes pale. At this time, if you walk into a room with a higher temperature, the blood vessels suddenly become thicker when exposed to heat, and the ears will also feel warm. Third, when you are shy, when you argue fiercely with others, or when you encounter difficulties in exams... you will also feel hot at the base of your ears. This is because the cerebral cortex is highly excited and tense, and the command nerves cause skin blood vessels to dilate, the heart beats faster, and the blood flow increases.