There are many causes of abnormal bleeding: - Hormones - Pregnancy - Problems with Reproductive Organs, such as:Infection in the uterus (pelvic inflammatory disease) • Recent injury or surgery to the uterus • Noncancerous growths in the womb • Inflammation or infection of the cervix (cervicitis) • Injury or disease of the vaginal opening • Endometrial hyperplasia - Medical Conditions, such as: • Polycystic ovary syndrome • Cancer affecting the reproductive organs • Thyroid or pituitary disorders • Diabetes • Cirrhosis of the liver • Lupus erythematosus • Bleeding disorders - Other causes may include: • Use of an IUD for birth control • Cervical or endometrial biopsy or other procedures • Changes in exercise routine • Diet changes • Recent weight loss or gain • Stress • Use of certain drugs including blood thinners • Sexual abuse • An object in the vagina