Understanding Irregular Menstrual Cycles: Causes & When to Worry

"A textbook period happens every 24-29 days," according to Dr. Marcelle Pick, but menstrual cycles that fall in the 23- to 35-day range are common. Because a "regular" period can be different for every woman, "irregular periods are simply what is irregular for you," she says.

Time Frame

• Women of all ages may experience irregular menstrual cycles.

  According to WebMD, when a girl first begins to menstruate, it "may take several years for the hormones that control menstruation to reach a balance." Women can also experience irregular periods as they approach menopause.

Diet

• Eat healthy

  Excessive weight gain or loss can cause irregular periods. Eating disorders such as anorexia or bulimia can interrupt a normal menstrual cycle.

Exercise

• Athletes can miss periods.

  Endurance athletes can experience irregular periods during times of intense physical exercise.

Health

• Both physical illness and emotional stress can cause an irregular menstrual cycle. Hormone problems might "cause a change in the levels of the hormones that the body needs to support menstruation."

Lifestyle

• Smoking, drug use and excessive alcohol use can all be factors responsible for irregular periods.