1. Do short-acting contraceptives cause women to gain weight? Theoretically, sex hormones may cause weight gain through different mechanisms, such as the sodium retention effect of estrogen; the appetite stimulating effect of progesterone; and the anabolic effect of androgens. However, studies have shown that the weight gain of COC users alas did not exceed the physiological range of change, and drospirenone in Yosmin has an anti-salt corticosteroid effect, better control of weight than the control group. 2.Does COC increase acne or torticollis? No. Nowadays, the progestins within short-acting contraceptives have anti-androgenic activity, especially Darien 35. 3. Does COC increase cardiovascular disease? COC increases the risk of VTE (venous embolism). the risk of VTE is highest in the first 4 months after taking COC and decreases thereafter. The risk of VTE is highest in the first 4 months after taking COC and decreases thereafter. It returns to the pre-drug level 3 months after stopping the drug. 4, COC and malignant tumors COC can reduce the occurrence of ovarian cancer, endometrial cancer. There is no significant increase in the risk of breast cancer. There may be an adverse effect on the occurrence of cervical cancer, but the role of HPV infection leading to cervical lesions needs to be excluded. 5. Does COC reduce fertility in women? COC is a reversible method of contraception, and fertility can be restored after stopping the drug. At the same time, COC can also protect women’s fertility through 3 effects. I. COC has an exact contraceptive effect and effectively reduces the occurrence of unwanted pregnancy and abortion. Second, COC effectively inhibits ovulation, which can reduce the occurrence of ectopic pregnancy. Third, the inhibitory effect of COC on cervical mucus can effectively prevent the upward mobility of acute infections in the lower reproductive tract and reduce the occurrence of pelvic infections. The negative effect of age on pregnancy was not increased in women with previous use of COC. The time frame of previous COC use also had no significant effect on fertility after discontinuation. 6, COC and pregnancy Pregnancy can occur after discontinuation of short-acting COC without waiting 3 to 6 months. There is also no need for artificial termination of pregnancy within a short period of time after stopping the drug. Studies have shown that there is no correlation between the use of oral contraceptives in early pregnancy and physiological defects in the newborn. The short-acting oral contraceptives mentioned here are now the third generation of oral contraceptives, such as Momoflurane, Daying 35, Yosmin, Tegretol, and so on.