Nothing causes it. It just happens to most women, whenever, wherever, and however it wants to happen.
It is controlled by the uterus. That is where the uterus lining is which causes the menstrual cycle
endocrine
the Endocine system.
You can't have a two day menstrual cycle. A menstrual cycle is the entire reproductive cycle, including ovulation and menstruation, so you can't possibly have a two day menstrual cycle. You may experience two day menstruation, or mid-cycle spotting for two days.
The menstrual cycle is the cycle of hormonal changes between your reproductive organs and brain that cause ovulation and in turn failing fertilisation causes menstruation. It is not possible for a menstrual cycle to last only two days.
Various things can happen to cause bleeding outside of the menstrual cycle. For example, it is possible for sex to cause bleeding.
The menstrual cycle is the reproductive cycle, as long as she is fertile she is always on her menstrual cycle. You can't tell where she is in her menstrual cycle unless she tells you.
The menstrual cycle seizes once the vagina is done shedding its lining otherwise for it to FULLY seize it would be during menopause or during a time of pregnancy.
Nothing causes it. It just happens to most women, whenever, wherever, and however it wants to happen.
The menstrual cycle is started by the release of certain hormones so I would say there is some sort of hormonal imbalance of the root of it. see a doctor.
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It is important to know the roles of each system in the body. The reproductive and the endocrine system is the cause of the onset of the menstrual cycle.