Hey Doc, I am wondering if birth control can cause tumor growth. My 16-year-old niece had a schwannoma tumor removed two years ago. There was a small piece left connected to spine. they monitor it and no growth until recently. Found out she had started taking birth control pills and wondering if this could have caused it.Julie __________________________________________________________________________ Dear Julie, An interesting question. BC pills are known to increase certain brain tumors such as gliomas. Schwann cells produce myelin which is how nerves communicate. Progesterone is the strongest stimulant to the production of myelin, so needless to say Schwann cells...