Pregnancy headache, nausea and vomiting itself are common early pregnancy reactions, but some diseases may also cause these symptoms, which are generally common for the following reasons: 1. Early pregnancy reaction: most pregnant women will experience headache, dizziness, nausea, vomiting, drowsiness and weakness around 6 weeks after menopause. This is related to the elevation of human chorionic gonadotropin and progesterone in the body and gastrointestinal dysfunction, which usually gradually disappears after 12 weeks; 2. Hypotension: as the blood circulation system will rapidly expand during pregnancy leading to a drop in blood pressure and insufficient perfusion of blood in local capillaries, symptoms such as headache and nausea will occur; 3. Gestational hypertension: when blood pressure rises, it may induce cerebral vasospasm, leading to intracranial pressure increase, resulting in headache, nausea and urge to vomit. If the symptoms persist and are accompanied by dizziness, blurred vision and other symptoms, promptly go to the hospital to exclude pre-eclampsia and other conditions; 4, intracranial venous sinus thrombosis: the blood of pregnant women will be in a hypercoagulable state due to the influence of hormonal fluctuations in the body, and a few pregnant women may develop venous sinus thrombosis as a result, which will manifest as headache, nausea and other symptoms, requiring symptomatic and causal treatment.