There are many causes of drowsiness in high school students, the common causes are mainly the following: First, neurasthenia, high school students with high academic pressure, often stay up late studying easily lead to neurasthenia, drowsiness, fatigue, mental lethargy, taking glutathione can regulate the disorder of the plant nerves, alleviate the symptoms, usually pay attention to the combination of work and rest, regular rest. Second, iron deficiency anemia, mostly seen in girls, due to academic pressure can cause abnormal secretion of hormones in the body leading to menstrual disorders, thus appearing iron deficiency anemia, mainly manifested as pale, drowsy, weak, inattentive, etc., taking ferrous sulfate can alleviate the symptoms. Third, fatigue syndrome, chronic fatigue as the characteristic clinical manifestations, can be accompanied by drowsiness, weakness, improve the relevant examination without organic lesions, through adequate rest and appropriate exercise, can effectively relieve the symptoms. Fourth, other factors, such as poor sleep quality, staying up late, overwork, mental stress, can also lead to the above symptoms, according to the clinical manifestations and the relevant examination, to clarify the specific cause of targeted treatment.