Is it true that early menstruation increases risk of developing breast, uterine, or ovarian cancer?

The main causes and symptoms of An important factor linked to cervical cancer is infection with one of the most common sexually transmitted diseases鈥攈uman papillomavirus (HPV). Some strains of HPV can cause genital warts while others have no observable symptoms. Individuals infected with the herpes simplex virus, human immunodeficiency virus (HIV) or acquired immune deficiency syndrome (AIDS) are at increased risk for developing cancer of the cervix; the associated suppression of the immune system allows the HPV to more easily invade. Other chronic infections and erosions of the cervix also may increase the risk of cervical cancer.While some women who have precancerous cervical changes experience no symptoms, others notice heavier or longer menstrual periods or vaginal bleeding after douching, intercourse or between periods. Symptoms of more advances stages of uterine cancer may include a foul-smelling vaginal discharge, rectal pressure or constipation, loss of appetite, fatigue, and back or leg pain.
it is always recommended to consult your doctor for best results.

earlier menstruation = more estrogen = greater risk for these cancers... so, yes

Yes it's true. Late Menopause has the same effect. It's important that this only increases the risk associated with estrogen positive cancers. Some cancers, estrogen has no effect so it would be unlikely that early menses has any effect.

Yeah.

Yes it can