According to Everyday Health, a short menstruation period may be caused by low estrogen levels, early pregnancy, menopause, birth control, thyroid disorder, polycystic ovary syndrome, weight loss, excessive exercising, e... More »

Bleeding or spotting between periods can be caused by a number of factors, according to Tracee Cornforth for About.com. These include implantation/pregnancy, low thyroid levels, stress, missing oral contraceptives, vagin... More »

Many things might cause the cessation of menstruation, including extreme weight loss, abnormal hormone levels, stress and athletic training, states Penn State Hershey Medical Center. Natural causes of stopped menstrual p... More »

Reasons for an abnormal period that's lighter than usual can range from stress, excessive exercise or birth control pill use to more serious problems, such as polycystic ovary syndrome, premature ovary failure or anemia,... More »

There are different causes of extra long periods including stress, premature ovary failure, endometriosis, birth control pills, pelvic inflammatory disease, polycystic ovary syndrome, hormone imbalance and uterine polyps... More »

Pregnancy, miscarriage, ovulation, polycystic ovary syndrome, birth control or pelvic inflammatory disease can cause spotting before a period, explains WebMD. Most women experience abnormal bleeding, and it isn't always ... More »

Aside from pregnancy, common reasons for a missed or late period include stress, low or high body weight, contraceptives, thyroid disorders and polycystic ovary syndrome, explains Healthline. Certain chronic illnesses, s... More »