a period is caused by the interaction of hormones and puberty.
See the related link on what causes brown discharge after period.
It causes menstruation (aka period). ~Karen~
Any number of causes. Food and the start of a period.
Essential means we don't know what causes it. Period!
pregnancy
Period comes when you drink Malta . It causes miscarriage.
The causes of coming your periods twice a week are because, either you are a new starter to your period, in other words, your period is new, or, you ovulated 2 eggs which happens rarely.
If you are bleeding and it's not your period, it is important that you see a medical professional. There are many causes for bleeding and not being on a period. Certain causes may be extreme stress, a side-effect of birth control, or even pregnancy.
illness
The hormones that rise and fall.
Your period..............maybe or skid marks
Pregnancy.