The risk of blood clots may be elevated with birth control pills, but it is impossible to generalize because of individual variability. The estrogen and progesterone components of birth control pills can increase blood coagulation factors, as well as decrease the activity of antithrombin, which promotes a hypercoagulable state of the blood and can increase the risk of thrombosis. Therefore, if patients take birth control pills for a long time can increase the risk of thrombosis, especially those who suffer from venous or arterial thrombosis or thromboembolism, they need to avoid taking birth control pills, so as not to aggravate the symptoms of the disease. However, due to individual variability, most patients taking birth control pills will not experience blood clots and need not worry too much. Common adverse reactions to birth control pills include menstrual disorders, breast swelling and pain, nausea and dizziness. If you experience any discomfort while taking birth control pills, it is recommended that you go to a regular hospital for a checkup and take relevant treatment measures under the guidance of your doctor. In daily life, you need to ensure sufficient rest and keep the perineum clean.