What causes a severe pregnancy headache?

Pregnancy headache severe, pregnant women should first measure whether the blood pressure is normal, some will show the performance of pregnancy hypertension. Secondly, also need to test blood routine. During pregnancy effective circulation volume is increased, relative to hemoglobin content will be reduced. Hemoglobin is carrying oxygen, when hemoglobin content is reduced, will cause hemoglobin oxygen reduction, will show symptoms of brain hypoxia and show headache performance. Therefore, it is necessary to check whether there is anemia in the blood routine. Moreover, pregnant women often show headaches, but also more common in vascular nerve headache. The main cause may be due to pregnant women often eat spicy, irritating food during pregnancy, can also induce headache symptoms.