Brief Answer: DETAILED BELOW Detailed Answer: Hello Thanks for writing to us with your health concern. I can think of the following reasons for your abnormal menstrual bleeding - 1. Weight gain is a major factor . 2. Stress , anxiety, tension on the personal or professional front, late nights, erratic eating habits - do any of these apply ? They are all known causative factors. 3. Vyvanse itself is associated with irregular menstrual bleeding. 4. Caffeine too is implicated. 5. If you have been sexually active, do take a pregnancy test, to rule out an ongoing pregnancy, an ongoing miscarriage, or ectopic pregnancy. 6. A new sexual partner / unprotected sex would not generally lead to heavy bleeding afterwards. 7. Thyroid hormone abnormalities, a cervical or uterine polyp, lesions or erosions on the cervix, uterine fibroids, endometrial hyperplasia, polycystic ovarian syndrome - these are all some conditions associated with irregular cycles and sporadic heavy bleeding. If the bleeding does not subside in a couple of days / it recurs again next month, I would request you to have a gynaecological consultation. You should have - 1. Internal check up - per vaginum and per speculum 2. Pelvic ultrasound scan 3 . Hormonal levels - FSH, LH, TSH, Prolactin, OGTT, free testosterone, DHEAS, lipid profile. 4. A bleeding and clotting profile to rule out bleeding tendencies. All the best. Please feel free to discuss further.

---