Long-term use of oral contraceptives may increase the risk of cerebral thrombosis. Long-term use of oral contraceptives can cause changes in hormone levels in the body, which can cause blood clots to form in blood vessels, increase blood viscosity and slow down blood flow, which can increase the chances of cerebral thrombosis. At present, the domestic use of steroidal contraceptives is containing ethinyl estradiol 20-35 micrograms, belonging to the low-dose steroidal hormone contraceptives, but also should not be taken for a long time. Relatively speaking, women after the age of 40 taking birth control pills, more likely to induce cerebral thrombosis. Because the hormone level of women after 40 years old is less stable, and the prevalence of hypertension, diabetes and other underlying diseases is gradually increasing, the chance of taking birth control pills induced cerebral thrombosis will also be correspondingly higher. So try not to take oral contraceptive pills for a long time, you can use other ways of contraception, such as the use of penile condom or intrauterine device.