1. Hormonal Imbalances
This is one of the most common causes of irregular periods in women. Hormones such as estrogen and progesterone regulate your cycle. Stress, thyroid issues, and other illnesses like PCOS can all have an impact on this state of balance. Most women are unaware that even stress can cause a hormone imbalance, leading to fertility issues.
2. Polycystic Ovary Syndrome (PCOS)
Polycystic Ovary Syndrome (PCOS) is a disorder in which numerous cysts form in the ovaries due to hormonal imbalances in the endocrine system. Women with PCOS tend to have ovaries packed with several tiny cysts, which disrupts normal ovarian function and causes irregular menstrual cycles, leading to fertility problems.
Also Read: PCOS - Managing and Treating Irregular Periods
3. Thyroid Disorders
Hyperthyroidism and hypothyroidism affect metabolism, but they also have a substantial impact on menstrual health. Hypothyroidism can result in heavier and longer periods, whereas hyperthyroidism might cause lighter or missing periods, disrupting your fertility. A reputed specialist or gynaecologist can assist you with the appropriate hormone tests and treatments.
4. Excessive Weight Gain or Loss
Excessive weight gain or loss leads to hormonal changes, which disrupt the body's natural cycles. Eating disorders or intense exercise may also cause amenorrhoea, which occurs when your body stops generating menstrual cycles entirely due to low fat levels that are harmful to hormones.
Also Read: How to get pregnant with irregular periods?
5. High Stress Levels
High stress levels can lead to a delay in getting your period and disrupt the ovulation cycle. To reduce the chances of causing anovulation, making lifestyle changes and managing stress is necessary. If you are feeling unhappy and stress at your job or school, you can try engaging in activities that allow you to relax and get enough rest.
6. Over‑Exercise or Under‑Exercise
Both excessive and insufficient activity might cause irregular periods. Intense or prolonged physical exertion, particularly when accompanied with insufficient calorie intake or rest, could affect the hormonal balance required for normal menstruation, potentially resulting in hypothalamic amenorrhoea. On the other hand, under-exercising or a sedentary lifestyle can lead to weight gain, which can also imbalance hormone levels and lead to irregular periods.
Also Read: Phases of Menstrual Cycle & their Impact on Mood
7. Uterine Fibroids, Polyps or Endometriosis
Mild growths in the uterus can also cause abnormalities in the menstrual cycle, particularly when there is severe bleeding or cramps. These growths are more common than most people realise and may not cause any symptoms until they advance. These polyps or cysts should be thoroughly scanned and diagnosed early on to ensure effective management.
Endometriosis is another condition that happens due to the growth of endometrial tissue outside of the uterus. The tissue often attaches itself to the ovaries or fallopian tubes. Endometriosis can cause excess bleeding, cramping, and severe discomfort before and during menstruation.
Also Read: Menopause Age: What to Expect & Early Signs
8. Pelvic Inflammatory Disease (PID) or Infections
Pelvic inflammatory disease (PID) is an infection caused by bacteria in the female reproductive system. It is usually caused by an undetected sexually transmitted infection (STI). Bacteria enter the vagina and spread throughout the uterus and upper genital tract. PID symptoms include a lot of vaginal discharge, an unpleasant odour, irregular periods, and pelvic pain.
9. Premature Ovarian Insufficiency (Early Menopause)
This disorder affects women under 40 whose ovaries can't function properly, resulting in early menopause. It can occur following cancer treatment with chemotherapy and radiation, as well as in those who have certain autoimmune diseases.
Also Read: Can I get Pregnant with PCOD/PCOS?
10. Medications, Contraceptives & Postpartum Changes
Most birth control tablets are a mix of hormones. The medications prevent pregnancy by stopping your ovaries from producing eggs. Menstruation might be affected when you start or stop taking birth control medications. You may experience irregular or skipped periods for up to six months after stopping birth control tablets.
Medications, such as steroids or anticoagulants (blood thinners), can also cause irregular periods.
Irregular periods after motherhood are caused mostly by fluctuations in hormone levels, particularly prolactin, and the start of ovulation.
