Contraceptives have harm, different contraceptives have different harm to the human body, short-acting contraceptives according to the regular use of harm is relatively small, but prone to thrombosis type of disease, need to rule out contraindications before choosing to apply. Emergency contraceptive pills may cause menstrual disorders, early pregnancy-like reactions, weight gain and hyperpigmentation when taken for a long period of time. There are many types of contraceptives in the clinic, such as short-acting contraceptives and emergency contraceptives. Short-acting contraceptives are composed of synthetic estrogen and progesterone, regular use of contraceptive effect is good, long-term use of possible hazards may be triggered by vaginal spotting, nausea, abdominal distension, breast distension, susceptibility to thrombosis-like diseases and other risks, need to rule out contraindications before choosing to apply. Emergency contraceptive pills used too often, may disrupt the menstrual cycle, irregular vaginal bleeding, prolonged menstrual cycle and other symptoms, this drug on the endocrine axis of the impact is very large, may lead to serious endocrine disorders, menstrual disorders, ovulation disorders and so on. It is recommended to take contraceptive pills under the guidance of a doctor and not to use them blindly.