Weakness and drowsiness can be seen in colds and flu, and may also be caused by transient cerebral ischemia and anemia. Patients should consult a doctor in time to clarify the cause of the disease. 1. Cold and flu: immunocompromised and children are susceptible to cold and flu, which is more common in spring and winter. Patients may have cough, sneezing, hoarseness, weakness and dizziness. Patients should pay attention to rest, drink more hot water, wear suitable clothes and pay attention to exercise. 2. Transient cerebral ischemia: a kind of transient neurological deficit caused by focal ischemia of part of the brain mostly seen in middle-aged and old people, it is more common in people with history of hypertension, atrial fibrillation and heart attack, etc. Patients can take drugs such as clopidogrel and heparin for treatment. 3. Anemia: Insufficient blood supply to tissues caused by a decrease in red blood cells or hemoglobin in the blood, resulting in symptoms such as weakness, drowsiness, fatigue, and tinnitus. You should find the cause of anemia with the help of your doctor and take iron supplements while treating the cause. Weakness and drowsiness may also be caused by other factors, and the patient should consult a doctor in time and use the above medications under the doctor’s guidance.