There are several reasons for the headache after a medication abortion: 1. A normal phenomenon. The side effects are different for different women, because there are individual differences, some women are more sensitive to the drug, the headache will be more severe. 2, because the metabolic function of the body has problems. This is because after entering the body, the drugs have to be inactivated by the liver and then excreted by the kidneys. If a woman’s liver function or kidney function has problems, it will cause the drug to stay in the body for a longer time, so that the drug continues to work in the body, it will stimulate the central nervous system of women, thus causing women to have headaches after a medical abortion. 3, other causes may also be a large amount of bleeding after a medical abortion, which leads to blood deficiency, physical weakness and headaches.