Common side effects of Oral Contraceptives
The most common side effects of the birth control pills include nausea, headache, breast tende ess, weight gain, irregular bleeding, and mood changes. These side effects often subside after a few months' use. Scanty menstrual periods or breakthrough bleeding may occur but are often temporary, and neither side effect is serious. Women with a history of migraines may notice an increase in migraine frequency.