Contraception is the application of scientific methods to make a woman temporarily infertile. It controls three main parts of the reproductive process: inhibiting the production of sperm and eggs; preventing the union of sperm and eggs; and making the uterine environment unfavorable for sperm to be able to survive, or for a fertilized egg to settle and develop. Common contraceptive methods include: the use of birth control pills, condoms, diaphragms, safe period contraception, in vitro ejaculation contraception, compression of the urethra contraception, surgical contraception, etc. 1.Short-acting oral contraceptive pill Not emergency contraceptive pill! Not the emergency contraceptive pill! Not the emergency contraceptive pill! The important thing to say three times! Many women take the emergency contraceptive pill as a regular contraceptive tool. Many women take the emergency contraceptive pill as a regular contraceptive tool and say to the doctor with a bewildered face, “I took the pill, how can I get pregnant?” When asked, the oral pill is the emergency contraceptive pill. The emergency contraceptive pill is a drug that obstetricians and gynecologists abhor, not to mention the low effectiveness of contraception (the overall clinical effectiveness <90%), and the risk of ectopic pregnancy, not to mention the large number of cases of women with menstrual disorders. Some girls also take the emergency contraceptive pill as a daily routine, not knowing that repeated oral emergency contraceptive pills in January are not effective. The real recommendation is the short-acting oral contraceptive pill, which is taken daily for 21 or 28 days in a month, and is available on the market from Ma Fu Long to Da Ying 35, and then to You Si Ming to You Si Yue, with prices ranging from 23 to 198 dollars, the difference being that the composition and dose of estrogen and progestin are different, but what you eat is once and for all. Pros: The contraceptive effect is over 99%. Disadvantages: need to be taken daily, especially for those ignorant girls who like to take the emergency contraceptive pill as sugar snap peas. Contraindications: people with blood clot disease, smoking more than a pack per day, please be careful, there is an increased risk of blood clots; serious cardiovascular disease, certain endocrine diseases, acute and chronic hepatitis and nephritis, you take enough drugs, the pill is not it; as for breast cancer, gynecological tumors, pre-cancer patients, I believe you do not want to make love. 2, condoms This needless to say it, it is suitable for the possible recent fertility requirements, and the temporary need for contraception, or not suitable for taking other forms of contraception people. The overall contraceptive effect > 95%, is the most common and most convenient way of contraception. But please be careful how you wear it! Pros: The best tool for eliminating STDs, especially for girls who like to cheat or date. Disadvantages: latex allergy men and women will be more miserable. Contraindications: In addition to allergies seem to be no? 3, IUD The quality of the IUD has improved greatly, and the variety of options is increasing, the duration of contraception also varies from 5 to 10 years, doctors no longer have to worry about the ring can not be taken out. At present, the most expensive imported ring, “Manuel”, is a progestin-rich medicine ring, placed in the uterus not only to prevent pregnancy, but also to reduce the amount of menstruation or even cause temporary amenorrhea, which is really the nemesis of the aunt towel. Advantages: Once and for all, it is suitable for those who do not have a birth plan for a short period of time and do not like the trouble of condoms, especially for postpartum mothers. Disadvantages: A minor surgery is required for placement and removal. Individuals may have symptoms of maladjustment. Contraindications: there are many, what inflammation, reproductive tract tumors, the uterine cavity is too large or too small, especially mention: uterine malformation patients, especially if it is a double uterus, you have more than others a room, it will have to take other contraceptive measures. 4, subcutaneous implantation is also a kind of drug contraception, but not all hospitals have. The method is to make a small incision in the forearm less than 0.5 centimeters, placed under the skin a silicone rod that can slow-release progestin, through the daily release of progestin into the bloodstream at a constant rate to play a contraceptive role. Newer subcutaneous implants, similar to the syringes used to tag people in science fiction movies, are now more convenient to place than ever before. Advantages: contraceptive effect >99%, eliminates the need for pills and condoms, and does not cause gynecological inflammation. Disadvantages: you have to go to the hospital to place and remove it; the biggest disadvantage is that it may cause menstrual disorders and spotting bleeding. Contraindications: the same as short-acting oral contraceptives. Having said that, there are actually many more methods of contraception, but I believe there is always one for you. The most important thing to do is to make sure that you have the best possible chance of having sex.