A large Danish study involving 3 million women found that some hormonal birth control methods were associated with a small increase in the risk of meningioma, the most common brain tumor in adults. The highest risk was linked to medroxyprogesterone birth control injections and high-dose hormonal IUDs, while lower-dose IUDs showed no increased risk. Researchers also found that the risk gradually declined after stopping these contraceptives and returned to normal within about five years for most women. Although the overall risk remains low, the findings may help women and healthcare providers make more informed contraceptive choices based on individual health needs.
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