What causes severe fatigue, nausea and drowsiness in children?
Patient: The past week and a half my 12 yr old son has been extremely tired after school - to the point where some days he will sleep right away. He had an espisode about a week ago at night with funny feeling head, instant drowsiness and nausea and last night his legs felt very heavy after walking up the stairs and he was nauseated. Not sure what to think.. Doctor: Hello. I just read through your question.Most often these things are caused by a virus which ultimately passes on its own. Rest and hydration are usually all we can do. One other diagnosis to consider  is Mononucleosis. I recommend  consulting with your doctor and discussing this possibility.