Drowsiness may be a symptom of subarachnoid hemorrhage, subdural hemorrhage and hematoma, reye's syndrome, anemia, anxiety, renal carcinoma, allergy, head injury, alcoholism, hypothyroidism, mononeucleosis, encephalitis, depression, liver disorder, kidney failure, kidney infection, common cold, flu, insomnia, sleep apnea, viral infections and narcolepsy. To learn more about the cause of your symptoms, click on each of the diseases listed below.
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