Is it normal to start bleeding heavily after stopping biodentical hormones? i am 51 years old.

No.: Any post menopausal bleeding needs further investigation by a gynecologist.

Bioidentical hormone: Bioidentical hormone therapy contains pharmacologically active hormones just like traditional hormone therapy. Unfortunately, they do not have the same level of regulation with regard to quality or safety. A bio identical regimen could cause endometrial hyperplasia just like traditional hrt. Withdrawal will can cause bleeding.