Irregular menstruation is when the length of the cycle is more than 35 days, or if the duration varies. A period, or menstruation, is the part of the menstrual cycle in which the endometrium, which is the lining of the uterus, is shed.

Medical Conditions. Two common causes of irregular menstrual periods are polycystic ovary syndrome (PCOS) and hypothyroidism. PCOS is a hormone imbalance that can affect ovulation, cause issues with a woman’s period and make it more difficult to get pregnant.

Most of the time, irregular periods are part of the normal changes that can happen when you’re a teen. … Sometimes, irregular periods can be caused by some medicines, exercising too much, having a very low or high body weight, or not eating enough calories. Hormone imbalances can also cause irregular periods.

Symptoms include irregular or no periods, obesity, acne, and excess hair growth. Women with PCOS have unusually high levels of the male sex hormone, androgen, or testosterone.

Irregular Periods and Getting Pregnant. Irregular or abnormal ovulation accounts for 30% to 40% of all cases of infertility. Having irregular periods, no periods, orabnormal bleeding often indicates that you aren’t ovulating, a condition known clinically as anovulation.

Now, let’s look at the most common causes of irregular periods: Eating disorders, like anorexia and bulimia. Excessive weight gain or weight loss; extreme thinness and obesity both cause your menstrual cycle to become irregular or even to disappear. Stress or emotional problems.

If you have irregular periods, try counting 36 days from the start of your last menstrual cycle or four weeks from the time you had sex. At this point, if you are pregnant, your levels of hCG should be high enough to detect the pregnancy.

“This process is caused perimenopause, and many menstrual changes can occur during this time. Periods are often irregular and can be heavier, lighter, longer, or shorter. … Here are 11 changes experts say may happen to your period in your 30s.

Menstrual cycles are caused by the rhythmic ups and downs of your reproductive hormones, and the physical changes those ups and downs cause. They trigger the growth of follicles in the ovaries, the release of an egg (ovulation) and the growth and shedding of the uterine lining (the period).