It can take a while for a girl's to settle into something regular. Most of the time, if periods aren't regular it's because a girl's body is still developing. It might be confusing or annoying, but it's totally normal.
Sometimes, though, changes in blood flow can be a sign that something more serious might be going on.
What Is Dysfunctional Uterine Bleeding?
Dysfunctional uterine bleeding (DUB) is the name doctors use to describe when something isn't quite right with a girl's periods. Doctors also sometimes call DUB "abnormal uterine bleeding" (AUB). Like lots of medical names, it can sound worse than it is. Most of the time, DUB isn't something to worry about.
If a girl has DUB, it might mean her periods last longer or have more bleeding than normal. Or, it might mean the opposite — that her bleeding is light and her periods aren't coming as often as they should.
Because DUB isn't usually a problem, doctors often don't do anything about it. But sometimes they'll take action if they worry that DUB might cause another problem. For example, doctors may worry that a girl could get if she is bleeding more than she should.
Most of the time, DUB happens because of changes in the body's hormone levels.
For teen girls, one of the most common causes of hormone changes is when the body doesn't release an egg from one of the ovaries. This is called anovulation.
The release of an egg is part of the hormone process that makes up the menstrual cycle. If a girl's body doesn't release an egg, too much extra blood and tissue can build up in the lining of her . When that lining eventually leaves the body, a girl can have more than normal amounts of bleeding. This bleeding might happen as part of a period or in between periods.
Anovulation is most likely to happen after a girl first starts getting her period. That's because the ovaries aren't fully developed yet. It can last for several years until a girl's periods become regular.
A doctor will want to rule out other health problems before deciding a girl has DUB. For example, doctors might find out that a girl with heavy periods has a bleeding disorder like von Willebrand disease.
To diagnose DUB, doctors will ask questions about periods and bleeding. Expect your doctor to ask the date your last period started.
A doctor also might ask questions that don't seem connected to bleeding — like about recent weight changes or if you have ever had sex. Doctors ask these questions because conditions like polycystic ovary syndrome and some STDs can cause abnormal bleeding. If they're not treated, they may lead to more serious health issues, like infertility (not being able to have a baby).
Girls who have had sex and miss a period need to see a doctor. Missed periods could be a sign of pregnancy as well as a sign of DUB. If you have heavy bleeding or bleeding between periods, it could be an infection or other problem. For example, an ectopic pregnancy (when a pregnancy implants someplace other than the uterus) can cause bleeding, and can be life-threatening.
A doctor might do a physical exam and maybe a pelvic exam. Sometimes doctors order blood tests or ultrasound exams. Blood tests also can show if a girl has anemia (fewer red blood cells than normal).
To decide if DUB is serious enough to need treatment, a doctor will look at a girl's level. This is a way to see if a girl has anemia or not:
Mild cases of DUB = a hemoglobin level of 12 or higher. A girl with a mild case of DUB is not considered anemic. Her doctor probably will tell her to keep track of her periods for a couple of months. The doctor might recommend ibuprofen or another nonsteroidal anti-inflammatory drug (NSAID) to decrease blood loss and ease pain from cramps. The doctor also might suggest taking a multivitamin with iron.
Moderate cases of DUB = a hemoglobin level between 10 and 12. Girls with this hemoglobin level are anemic. Doctors often recommend hormonal treatment, which usually means birth control pills. Doctors might also tell a girl to take iron pills.
Severe cases = a hemoglobin level below 10. A girl with a severe case of DUB bleeds heavily. She may faint, feel dizzy, look pale, and have low blood pressure or a high heart rate. In severe cases, she might need treatment in a hospital and, possibly, a blood transfusion. Most cases of DUB are not severe. Most of the time, a girl with a severe case of DUB has a bleeding disorder.
Most girls just need time for their bodies to adjust to their hormones. Eventually, their menstrual cycles get regular naturally. If you're ever worried that your period might not be normal, talk to your doctor.