Headaches, nausea, and vomiting may occur with a fall to the head, but not necessarily in every patient. First of all, a fall on the head has to cause severe craniocerebral injury, intracranial hemorrhage, cerebral contusion, or traumatic subarachnoid hemorrhage for a patient to develop severe headache, nausea, vomiting, vision loss, blurred vision, optic papillae edema, and these increased intracranial pressures. If the situation is particularly severe and the intracranial pressure exceeds 300 mmH2O or more, the patient may experience confusion, blurred vision, or even coma. If the resulting intracranial hemorrhage and cerebral contusion are more severe, the patient may also experience impaired mobility of the limbs as well as sensory deficits. If these conditions do not occur, the patient is likely to have only localized scalp pain and recover after about 2 days of rest.