are they normal in teens?

They aren't normal period. Fibroids are abnormal at any age.
ALthough less common in teens - I have seen cases of fibroids as young as 13. Monitoring them via ultrasound periodically to make sure they are not growing excessively and treating any symptoms like pain or discomfort is usually the first step medically.

It is less common for teens to have fibroids.
Fibroids are very common in women in their 30s and 40s. By the time they are 50, about 80 women out of 100 have fibroids. But fibroids usually do not cause problems. Many women never even know they have them.
Long, gushing periods and cramping.
Fullness or pressure in their belly.
Low back pain.
Pain during sex.
An urge to pee often.
Heavy bleeding during your periods can lead to anemia. Anemia can make you feel weak and tired.

They aren't normal, and they can cause a lot of problems, young or old. I was in my early 20's when I found out I had a uterine fibroid. It was causing me to bleed half to death every month, but there are some women out there that have fibroids that don't cause any problems at all. SInce I was having major problems, the doctor I was going to did a couple surgeries on me, but when that didn't help, he told me I would have to have a hysterectomy at the age of 24. That was not an option to me, so I found a new doctor, had the surgery that I needed (he removed the fibroid completely) and haven't had any problems since. Plus, everything is still intact and I can still have children. Finding a new doctor was the best thing that I ever did.

If you're a teen and you're having problems, go to a doctor. I just wish I started going when I was younger. If I had started going when I was still a teen, I don't think my problems would have escalated to the point where I was almost dying every month. And if you're young and the doctor you're going to tell you you need to have a hysterectomy, find another doctor!!! There is no cure for fibroids, but there are ways to get rid of them. Just remember if you have them removed, there is always the possibility that they could grow back.

Have you ever noticed that women today have so many more problems at a young age than 50 years ago??? I honestly think there's something wrong somewhere.