After waking up in the morning without fever, but the face appears hot phenomenon, and after two hours after the normal, may be related to environmental temperature changes, emotional changes and other physiological factors, there may also be the possibility of pathological factors. 1. Physiological factors: facial skin redness and scalding phenomenon, in the clinic, in addition to pathological factors, more often seen in some physiological factors, such as emotional excitement, changes in environmental temperature and other reasons caused by the expansion of facial blood vessels and lead to the temporary redness and scalding. 2. Pathological factors Hypertension: Due to the fluctuation of elevated blood pressure, the facial blood vessels expand for a short period of time, which will be manifested as facial redness and heat in the clinic, and may also be accompanied by dizziness. After excluding some physiological factors, it is necessary to further improve the temperature measurement, blood pressure testing, electrocardiogram and other examinations. For the prolonged redness and burning of the face, it is necessary to consult the doctor in time and improve the relevant examinations as soon as possible.