Causes of Dysfunctional Uterine Bleeding (DUB) is mostly due to hormonal imbalances.
DUB can be of two types:
- Ovulatory DUB
- Anovulatory DUB
The mechanism of DUB is as follows:
- OVULATORY DUB: About 10% cases of DUB women may be ovulating. Estrogen levels are low which delays the secretion of progesterone and hence there is break-through bleeding and irregular shedding of the uterine lining.
- ANOVULATORY DUB:90% cases of DUB are due to anovulation that is absence of ovulation. They are common in extremes of reproductive age that is early puberty and periods nearing menopause. In patients, in whom ovulation does not take place, that is, no egg is formed, progesterone does not form. As a result estrogen is produced continuously leading to overgrowth of uterine lining. Periods get delayed and when it occurs, they are heavy and prolonged. This is one of the leading causes of DYSFUNCTIONAL UTERINE BLEEDING (DUB).
Why this occurs is not exactly known, but the causes of DYSFUNCTIONAL UTERINE BLEEDING (DUB) could be psychological stress, weight (excess or reduced), exercises, endocrine problems or idiopathic (unknown).