Hello dear, Understand your concern. Following are the reason for late periods: 1. Pregnancy: in sexually active women. 1. High level of stress 2. Change in life style 3. Late ovulation 4. Excessive exercise 5. Drugs: Birth control pills, tyroid medication, Excessive tea and caffeine 6. Thyroid problem 7. Hormonal imbalance 8. PCOS 9. Endometriosis 10. Molar pregnancy, ectopic pregnancy: Pregnancy kit may give negative results 11. Cancer Also note that Menstruation required co ordinate action of various hormone that secreted by ovary (estrogen and progesterone) and brain (FSH and LH). If any above hormone is decreased or increased there is imbalance in menstruation. So please do full hormonal profile : Estrogen, progestron, LH, FSH, HCG and thyroid hormone. That help to diagnose hormonal imbalance. Also consult with gynecologist and test for Pelvic examination USG Emndometrial biopsy Ovarian Follicle study Hysteroscopy PAP smear Take following advice 1.Limit caffeine, salt and nicotine from a few days before your period until two weeks after it 2. Healthy lifestyle 3 Stretching and regular exercise routines will reduce cramping and menstrual pain. 4. Yoga can be extremely helpful to reduce both the physical and mental symptoms 5. Massage can also help both physical and emotional symptoms. also relieve depression, anxiety and panic attacks. 6. Hot baths help with cramping, back pain and relaxation. 7. Sleep of at least 8 hours Maintain hygiene like below: 1. Salt Bath- Wash your vagina with concentrated salt water whenever you feel the itch. This will give you great relief instantly and prevent further multiplication of bacteria. 2. Keeping The Vagina Dry (Not wet, clean well) 3. Wear pure cotton Loose underwear Hope this may help you. Best regards Dr. Sagar