Pregnancy headache, nausea, want to vomit itself is a common early pregnancy reaction, but some diseases may also lead to these symptoms, generally common in the following reasons: 1, early pregnancy reaction: most pregnant women will be around 6 weeks after menopause, headache, dizziness, nausea, vomiting, drowsiness, fatigue and other symptoms. This is related to the elevation of human chorionic gonadotropin and progesterone in the body, gastrointestinal dysfunction, and generally disappears gradually after 12 weeks; 2. Hypotension: due to the circulatory system will be rapidly expanding during pregnancy resulting in a drop in blood pressure and insufficient perfusion of blood in the local capillaries, headache, nausea and other symptoms; 3. Hypertension during pregnancy: when the blood pressure is elevated, cerebral vasospasm may be induced, resulting in intracranial pressure increase, resulting in headache, nausea and vomiting. If the symptoms persist and are accompanied by dizziness, blurred vision and other symptoms, it is necessary to go to the hospital in time to exclude pre-eclampsia and other conditions; 4, intracranial venous sinus thrombosis: the pregnant woman’s blood is in a state of hypercoagulability due to hormonal fluctuations in the body, and a small number of pregnant women may have venous sinus thrombosis, which will be manifested in headache, nausea and other symptoms, and requires symptomatic and causative treatment.