Dark brown,dense period blood throughout the mensturation period.Its been happening for last two months.periods are coming on time though.There is no proper blood flow.only dark brown dense blood on all 5days of period.what could be the possible reason? Already visited a doctor and asked to put off weight.Since then exercising daily. I had never had any periods related issues before.Rather I always had heavy flow and cramps during my those days.Now there is no cramps either.Its freaking me out cause this is the 3rd month I'm experiencing the problem and I don't know what's wrong with me.