What happens to my face when it is hot? There are many causes of facial fever, usually due to increased body temperature or dilation of blood vessels in the face, which may be physiological or pathological. Dilation of blood vessels can cause redness and heat in the face. For example, some people experience facial heat when they are shy, angry, or ashamed. In the cold winter, if we walk from the warm indoor to the cold outdoor, the face is stimulated by the cold, so the body will make some protective measures on its own to strengthen its own face blood supply, then the face will appear red and hot phenomenon. But these are some very normal phenomena, is our body’s own reaction, do not need to worry too much. Another kind of red and hot face is a sign of some disease in your body, for example, after the body temperature rises, the blood vessels in the face expand, causing increased heat dissipation, and then you will have a hot face. When the heart and lungs are not functioning well, the heart is not able to send blood to all organs of the body well, which may lead to redness and burning of the face. So when you find that your face is burning, you don’t need to worry too much, you can observe it for a while and see what is causing it. If the body is suffering from other diseases, it should be treated promptly.