The cause of headache is very complicated for many people, not only pregnant women, because many diseases can be accompanied by headache, so headache may be only a manifestation, not a disease. If you have headache, you should screen the causes as follows: 1. If you have cervical spondylosis before pregnancy, or if you have head disease before pregnancy, such as having brain tumor or having migraine, or having ophthalmic glaucoma, these causes may aggravate the headache; 2. Even if you don’t have headache disease during pregnancy, many people have sleep disorders during pregnancy due to the change of hormone level, it is difficult to fall asleep, wake up easily, hard to fall asleep again, etc. And there are some people facing pregnancy and childbirth will have tension, anxiety, some will even have pre-depression performance, which may all lead to headache; pregnant women need to regulate their own mood, try to adjust their sleep habits, etc., or seek medical attention; 3. If the headache is not caused by the above reasons, only the headache during pregnancy alone, it may be the most common pregnancy-related headache of hypertension during pregnancy. In addition to headaches that can be accompanied by significantly high blood pressure and edema, hypertensive disorders during pregnancy can also include dizziness and blurred vision. If left untreated and allowed to progress, cerebral edema, cerebral hemorrhage and even death in some pregnant women may occur. In case of severe headache, pregnant women should seek immediate medical attention.