Short-acting oral contraceptives have the following main harm to the body: First, class early pregnancy reaction, some people may feel nausea, dizziness, fatigue and such a symptom after eating, the first three months of taking the drug is easy to appear, then you can eat a little vitamin B6 to improve the symptoms. Secondly, it may cause vaginal bleeding, also called breakthrough bleeding, which occurs when the patient misses the dose or does not take it in accordance with the prescribed time and lead to the phenomenon. Third, there may be menopause or low menstrual flow, is due to the long time after taking the pill led to the atrophy of the uterine lining, the menstrual flow is relatively small, this phenomenon in the discontinuation of birth control pills will be immediately restored, so do not be too nervous. In addition, a very small number of women after taking the pill will lead to weight gain, this situation is the time to take a longer period of time caused by the estrogen in the contraceptive pill can lead to water and sodium retention, progesterone has a weak androgenic effect, can promote anabolism in the body, such an increase will not lead to obesity, and will not affect the health. A very small number of women may have hyperpigmentation after taking birth control pills, that is, light brown pigmentation on the face, which will be reduced or restored after stopping the pill.