May Be Caused by

 Common

Carcinoma of endometrium

Endometrial hyperplasia

Endometrial polyp

Endometritis

Gestational trophoblastic disease

Hematometra

Intrauterine pregnancy

Obstructed cervix

Obstructed endometrium

Pyometra

Retained products of conception

Tamoxifen changes

 Uncommon

Leiomyoma