According to a research, women who have irregular menstrual cycles appear to have a far increased chance of developing heart disease. One's menstrual cycle may suddenly fall outside of the usual range, often fewer than 21 days or more than 35 days, affecting up to one in five American women of reproductive age, or around 12 million of them. According to a team of experts in China, irregular menstruation cycles can at best be inconvenient for millions of women, but at worst they dramatically raise women's risk of heart disease by 19 percent and of an irregular heartbeat by 40 percent. 3.4 percent of the women with irregular cycles suffered heart disease, compared to roughly 2.5 percent of the women with normal periods, according to the study, which tracked more than 58,000 women for 12 years. "These findings have important public health implications for the prevention of atrial fibrillation and heart attack among women," said Dr. Huijie Zhang, professor at Southern Medical University in China and study's lead author. "These findings also highlight the importance of monitoring menstrual cycle characteristics throughout a woman's reproductive life." the UK BioBank, a significant population health research programme with detailed genetic and health data from half a million UK participants, which is the source of the study, which was published in the Journal of the American Heart Association. The participants' average age was 46, and none of them had cardiovascular disease at the outset of the trial. The five indicators of a healthy menstruation, as revealed by a chemist According to chemist Amina Khan, your menstrual cycle should be between 28 and 35 days, you shouldn't have PMS symptoms, and your period should last between three and seven days with red blood. 827 incident instances of coronary heart disease, 199 heart attacks, and 1,623 cardiovascular "events" were documented among the patients after 11 years and eight months.