It is very common to see a slight nausea after a bump on the head, and it must be treated according to the specific situation. If there is no other reaction than nausea after a bump, you only need to take regular rest, ensure sufficient sleep, and increase necessary nutrition, and you will basically get better after 3 days. However, in some cases, the condition may gradually worsen, nausea, vomiting, or even severe explosive head pain, and there may be late reactions. This is when it is important to go to the hospital for a CT examination to clarify the changes in the condition. Therefore, it is recommended that it is very important to get enough sleep at this time, but you must also tell your family members around you to wake you up regularly and ask basic questions, such as what is your name and where are you, and answer correctly that there are no special signs and you just need to rest. But if the answer is not correct, go to the hospital promptly for examination, it is likely to be a case of rebleeding.