Hi and thanks for the query, Irregular menses is a frequent condition in women, but it becomes preoccupying if it is repetitive and stays for months apart. A few things must be considered in your case. The commonest cause of long lasting periods which must always be excluded is a possibility of a pregnancy. It would be worthwhile to do a pregnancy test if you have been sexually active lately. If not, other medical conditions are considered. The problems can either arise at the level of the pituitary gland that secretes follicule stimulating hormone which eventually acts at the level of the ovaries, thyroid hormone under or over secretion, uterine malformations, ovarian problems like polycystic ovarian disease and some abnormalities like the imperforate hymen or the transverse vaginal septum. My suggestion is actually booking an appointment with a gynecologist for a proper evaluation. Thanks and hope this helps, Luchuo, MD.