Headache and dizziness after a head injury may be normal or pathological, as follows: 1. Normal: In clinical practice, headache and dizziness after a head injury are relatively normal and generally do not require special treatment. 2. Pathological: It must be noted that if the headache persists for more than three days, or if the headache and dizziness gradually increase at that time to an unbearable degree, and also accompanied by nausea, vomiting, seizures, numbness and weakness of the limbs, speech dysfunction, and even had a coma at that time, etc. If you have any of these conditions, you must go to the hospital for a relevant examination, or at least a CT of the head, because in many cases it may be a brain hemorrhage, brain contusion, and other changes in the condition, and even in special cases it may cause brain herniation, causing life-threatening, so it must be evaluated according to the actual condition of the patient, so that it is more accurate.