What Causes Periods Delay Apart From Pregnancy?

Pregnancy and lactation are 2 natural factors responsible for delay in periods in young ladies. Other reasons of delay in periods are

1. Use of hormonal birth control methods
2. Certain medicines like antidepressants, oral corticosteroids etc
3. Stress
4. Chronic illness
5. Under weight
6. Thyroid problems
7. Tumors in pituitary gland
8. Excessive exercise
9. Hormonal imbalance