Hitting your head and wanting to vomit is a clinical manifestation after head trauma. After head trauma, there will be nausea, vomiting, headache, dizziness and other symptoms. It depends on the intensity of the force that the patient hit his head, if it is very heavy need to review the head CT, to see if there is bleeding in the skull, whether there is a cerebral contusion. If the head CT does not show any post-traumatic changes, the urge to vomit or the headache or dizziness will subside after about two days of rest and there is no need to worry too much. Age is also a major factor in head trauma. young people should not have their head CT checked again if there are no changes in their head CT the first time after a head trauma. older people over the age of 60 are advised to have their head CT checked again in a week or so to look for delayed intracranial hemorrhage, such as a subdural hematoma.