Final answer:
Menstrual bleeding that is abnormally long or intermittent is called dysfunctional uterine bleeding (DUB), and it can result from hormonal imbalances or part of natural cycle variations.
Step-by-step explanation:
Menstrual bleeding that occurs for extended periods of time or intermittently throughout the cycle is referred to as dysfunctional uterine bleeding (DUB). This condition is characterized by abnormal bleeding patterns that are not associated with any obvious uterine abnormalities. DUB can occur due to hormonal imbalances or as a part of the natural menstrual cycle variations that some women may experience.
Menstruation is the shedding of the endometrium (the lining of the uterus) when no fertilization has occurred, and it usually lasts about 4 days. Menstrual blood loss averages about 35 mL and the process can be accompanied by uterine cramps, which can range from mild to severe. Dysfunctional uterine bleeding is different from normal menstruation because of its irregular and prolonged nature, and may require medical evaluation.