Your daughter's physician may recommend that you wait to see if the problem will correct on its own.
If your daughter is experiencing painful menstrual problems (a common problem for teens) heating pads and over-the-counter medications like ibuprofen or naproxen sodium may help. If they don't relieve the pain, a healthcare provider may prescribe birth control pills.
Other treatment options may include monthly progesterone pills or other hormone replacement therapy, depending on the cause of the problem.
If your daughter is anemic, it's a good idea for her to eat more foods that contain iron (such as lean meats, legumes and vegetables) and take an iron supplement.