ovarian cysts
"I started this birth control my freshman year of high school (15-16) due to ovarian cysts. I absolutely adored this medication until about six months ago. Six years on the same pill is pretty impressive! I knew exactly when my period would start and end. Friday at three gone by Sunday at one. About six months ago I started feeling v mood swing, sadness (for no reason), crying out of no where, weight gain and inability to loose weight (which in fairness could be caused by my ovarian disease). All of those symptoms are also what people with Thyroid issues have. I had my thyroid checked and it turns out it was an abnormal hormonal level due to long use of this birth control! Other than that i have had absolutely no problems at all."