What condition is characterized by excessive menstrual bleeding?

Menorrhagia is the correct answer, as it specifically refers to excessive menstrual bleeding. This condition is characterized by menstrual periods that last longer than seven days or involve a flow that is so heavy that it disrupts daily activities or requires the use of double sanitary protection.

The other terms have distinct definitions: metrorrhagia refers to bleeding that occurs between menstrual periods, dysmenorrhea denotes painful menstruation, and endometriosis is a condition where tissue similar to the lining of the uterus grows outside of it, which can also cause painful periods but does not specifically pertain to the volume of menstrual bleeding. Menorrhagia focuses solely on the amount and duration of menstrual bleeding, thus making it the accurate answer in this context.