help please!

Hi there!

It's about a girl of 19 years of age who has some menstrual problems.
She often has irregular periods and also excessive bleeding.
Sometimes the vaginal bleeding lasts for as long as 3-4 weeks.
She is not a sexually active person.

It would be helpful if we can have more information about the causes of these problems.
Also suggestions of natural remedies (for instance some herbs) are the most welcome.
Can these problems be of psychological type?

Thanks in advance for your precious help!
B.J. Tweet