-Smoking: some studies have stated that smoking is a bad habit, directly influence the menstrual cycle of the sisters. -Alcohol and drugs: studies have shown that alcoholism or drug use reduces the fertility of women that the original expression is chu doldrums irregular menstruation.-Exposure to pesticides, air pollutants, heavy metals and petrochemicals: all these factors are serious impacts to fertility (and overall health) of the sisters.-Contraception by uterine: this tool is easy-to-measure leading to vaginal and uterine infections, causing irregular menstrual cycle. It can even cause fallopian tube blockages and lead to infertility. -Sickness, disease: for example, diabetes, kidney disease, urinary tract infections, gonorrhea, syphilis ... all can affect your menstrual cycle.Pregnancy
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