The causes to be considered include physiologic factors, infectious diseases, and autonomic dysfunction after waking up in the morning with a hot face and forehead. 1. Physiological factors. (1) Environmental factors: if the temperature around the sleeping area is high when sleeping at night, there will be symptoms such as face and forehead fever and sweating when getting up in the morning. (2) Emotional factors: for example, when sleeping at night, due to frequent nightmares, resulting in emotional tension, the capillaries of the face are congested, and the symptoms of getting up in the morning with a hot face and forehead occur. 2. Infectious factors: including bacterial infection, viral infection, etc., which leads to an increase in body temperature and fever in the face and forehead after waking up in the morning. 3. Autonomic dysfunction: prolonged irregular sleep and excessive psychological stress can lead to autonomic dysfunction, which can lead to the symptoms of morning after waking up face and forehead fever. There may also be other reasons for the heat in the face and forehead after getting up in the morning, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.