Metrorrhagia is uterine bleeding at irregular intervals, mostly between the expected menstrual periods. Metrorrhagia can also be defined as 'off schedule' bleeding. The bleeding, usually of normal or slight, occurs at either irregular or regular intervals apart from the normal menstrual flow.
It can be caused by a hormonal imbalance (hyperthyroidism or hypothyroidism); pregnancy disorder; cervical lesions; medications (birth control pills, corticosteroids, hypothalamic depressants, anticholinergics, anticoagulants); uterine fibroids; functional ovarian; polyps ;carcinoma of the vagina, cervix, endometrium or ovary; renal or liver disease; coagulation disorders; anabolic steroid use; IUDs or other trauma.