Nausea after taking birth control pills is often caused by adverse reactions to the medication. The pill is usually made of estrogen and progestin, and the change in hormone levels in the body after taking the pill can affect the physiological functions of the digestive tract, leading to nausea, vomiting and other uncomfortable symptoms. If you are nauseous after taking the pill, drink more warm water, put some ginger slices or honey in the water may ease these uncomfortable symptoms, generally the symptoms of nausea can be relieved within 24 hours. If the vomiting symptoms are serious, you should suspend taking the pill. If the nausea and vomiting symptoms are not relieved continuously, you can take antiemetic drugs for symptomatic treatment as prescribed by the doctor. After taking the pill, you should choose to eat easily digestible food, such as millet porridge, noodles and so on. At the same time, you should avoid eating spicy, stimulating and greasy food to avoid aggravating the gastrointestinal discomfort reaction, and you can eat more fruits and vegetables to supplement vitamins and relieve the discomfort symptoms. About 12 days after taking the oral contraceptive pill, you can rule out pregnancy by ovulation test or by going to the hospital for a blood HCG test. Also care should be taken to reduce the use of birth control pills, especially for women with gastrointestinal disorders, and avoid using them as much as possible.