There are many clinical causes of lethargy and drowsiness, the most common are the following two diseases: first, depressive state, depressive state is mostly seen in female patients, especially menopausal women are more common, mainly due to insomnia caused by prolonged mental stress, patients can also be accompanied by depressed mood, decreased interest, self-blame, depressive state can also be serious manifestations of panic, chest tightness, belching and other somatization symptoms. Patients should usually maintain an optimistic and cheerful mood, appropriate participation in sports and social activities, the necessary time to go to the Department of Psychiatry for consultation. Second, insomnia, prolonged insomnia patients can also appear weakness, dizziness, drowsiness and other symptoms, patients mainly show difficulty in falling asleep, dreamy, early awakening and difficulty in falling asleep again after waking up. Due to the poor quality of sleep the organism does not get sufficient rest, so the symptoms of weakness and drowsiness will appear. Patients are advised to develop good sleep habits, mental relaxation, and if necessary, it is recommended to go to the neurology department for consultation. Third, anemia, anemia patients are often accompanied by pale face, panic, chest tightness, loss of appetite and other symptoms, the blood routine suggests that the number of red blood cells is reduced, hemoglobin content is reduced. Fourth, hypothyroidism, patients may be accompanied by bradycardia fear of cold, loss of appetite, mucinous edema, thyroid function tests suggest a decrease in T3, T4, and an increase in TSH.