A bump on the head that results in dizziness, unconsciousness, nausea and vomiting indicates a more serious condition, while a large bump is usually less problematic. If the head accidentally hit a large bag caused by intracranial injury will appear a series of symptoms, including dizziness, coma, nausea and vomiting, etc., which indicates that the condition is more serious and need to consult a doctor for early diagnosis, to avoid delaying the condition. If there is a large bag on the surface without other symptoms, the problem is usually small, but if there is dizziness and nausea, you should consult a doctor in time. If you can’t recall the specifics of your injury, known as retrograde amnesia, it indicates a cranial brain injury and you should be hospitalized for observation. It should be noted that the place of impact, if mixed with other foreign objects need to be promptly debridement, and to be anti-infection, tetanus prevention and other treatments to avoid infection.