Other causes could be polycystic ovarian syndrome, diseases of pituitary gland, hormonal imbalance of
estrogen and progesterone
and uterine abnormalities like fibroid
and cervical dysplasia. Your doctor may consider tests like blood sugar levels, thyroid function test, prolactin, follicle-stimulating hormone (FSA), estrogen, and testosterone. Imaging studies, such as ultrasound, X-ray, and CT scan may also be recommended in certain individuals.
I hope it helps.