Headache and nausea is one of the common symptoms in neurology and can be seen in a variety of conditions. First, hypertension disease, poorly controlled blood pressure, resulting in high blood pressure, can cause headache and nausea, and this condition is mainly treated with antihypertensive therapy. Second, the symptoms of headache and nausea can also be caused by cold and fever, which require timely antipyretic and anti-cold medicine treatment. Third, in summer heatstroke, headache and nausea can also occur, mild cases can be relieved by resting in a cool environment, serious cases need timely treatment in hospital. Fourth, it can be seen in cerebrovascular diseases, such as neuropathic headache, vascular pain, cerebral thrombosis, cerebral hemorrhage, etc., which need to be treated according to different causes. When symptoms of headache and nausea appear, you need to go to the hospital promptly and get active treatment after clarifying the cause.