How much menstrual blood is too much? when should a doctor be seen about vaginal bleeding?

> 100 ml: If the blood loss is more than 100 ml/cycle it would be prudent to consult a doctor. If you think the blood loss is excessive take oral iron and multivitamin supplement to prevent anemia. for more information you may consult this article: https://www.ncbi.nlm.nih.gov/pubmed/11704173 For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Get HPV vaccine.

More than few pads: Hard to gauge heavy bleed, but if you need more than a couple of maxi pads and bleeding persists for more than s week, you might consider a trip to the OB GYN to discuss things