ovarian cysts
"This form of birth control helps with my making my period lighter and way less painful but it has caused me to have both weight gain and crazy mood swings. I've only been on this pill for 5 months but it's already causing me a headache. I feel depressed at times, upset and even having problems when it comes to my sex drive. I'm not sure if that's this birth control or what but I'm only 21. I shouldn't be having these problems."