It depends. Pain and bloating can be signs of ovarian cancer, but they can be just from a painful period. Ovarian cancer would be more likely in older women, like 40+ years, and most likely in women 70+ years. Other tests, like pelvic exam, ca-125, and transvaginal ultrasound would be needed. The ultimate way to know is surgery to see if it is in fact, a tumor of something else.