What happens when the head is hit depends mainly on the reactions that occur within the skull after the impact, as follows: i. If the impact is relatively mild, the patient may simply develop a scalp hematoma, which may also be accompanied by symptoms of brain oscillations. In this case, the patient may experience dizziness, headache, nausea, vomiting and other symptoms. Second, if the head impact is relatively strong, vigilance is required, and most importantly, a CT scan of the patient’s head is needed. If the patient has an intracranial hematoma with a large amount of hematoma on the CT scan of the head, the patient will not only experience dizziness, headache, nausea, vomiting and other symptoms, but in severe cases, coma may occur. In patients with larger amounts of bleeding, the intracranial pressure is greatly elevated, a condition that requires early surgical treatment to remove the hematoma. If the injury is a little more severe, it is likely that the patient will not be sent to the hospital, or may be sent to the hospital for surgical treatment, and their prognosis will be poor.