My Doctor ,My Menstrual Cycle Is 90 Days As Same As First Time , I Want To Know Why?

90 Days cycle is not normal. It should be of 26-32 days. You should be investigated for following conditions by visiting a doctor.

1. Chronic Illness
2. Excessive exercise
3. Under weight
4. Thyroid problems
5. Pituitary problems
6. Hormonal imbalance
7. Psychological problems.

If you are also taking some medicines like corticosteroids and antidepressants then it can be one of cause. Usually, long cycle are due to polycystic ovarian disease. There are no permanent cures of this condition but can be manged by minor surgery and patient can get pregnancy.