There are many causes of head drowsiness, the common causes are mainly the following: First, physiological factors, such as poor rest, staying up late, disorder of rest and rest can cause the symptoms of head drowsiness, but this is often transient, after sufficient rest can be effectively improved. Second, the viral cold, the disease can not only cause head drowsiness, mental lethargy and other symptoms, but also can lead to sore throat, and even fever, taking antiviral drugs, such as Lianhua Qingfei capsule, cold granules can symptomatically relieve the symptoms. Third, iron deficiency anemia, the disease is one of the common diseases that lead to head drowsiness, because the decrease in hematocrit will cause the oxygen-carrying capacity is insufficient, resulting in brain ischemia, hypoxia, so that the symptoms of head drowsiness, improve the routine blood test can be clearly diagnosed, and its treatment is mainly to actively supplement iron. Fourth, abnormally high or low blood pressure can make people feel drowsy in the head.