What are the Causes Behind Irregular Periods?

Updated:31-03-2025

Irregular periods, medically known as oligomenorrhea, are quite common these days.

Today, every two out of five women suffer from this.

Menstruation is caused when the endometrium of the uterus is shed.

The menstrual cycle varies from 28 to 35 days in females.

Menstruation generally starts at the age of 10, or can differ in some cases, and continues until the age of 45 or above.

The stage when the period stops completely is known as menopause.

First of all, let us discuss what irregular periods are.

Irregular Periods

The normal period cycle is 28 to 35 days.

Any variation in this cycle, such as the time between two consecutive periods increasing, periods occurring more than once in a month, or even excess bleeding for a continuous two months or more, is called irregular periods.

Missed or irregular periods are the result of the hormonal imbalances in a female’s body.

These hormonal imbalances can be caused by the following:

  • Eating disorder
  • Stress
  • Unhealthy lifestyle
  • Over-exercise
  • Polycystic ovarian syndrome
  • Weight loss or weight gain
  • Treatments such as chemotherapy
  • Certain medications and drugs
  • Smoking and alcohol.

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