Ovarian cancer is one of the most deadly cancers in women. That’s because the symptoms of ovarian cancer do not become apparent until the disease is advanced. But new research says that there may be early symptoms of ovarian cancer such as back pain, constipation, gas, abdominal distention, bloating, fatigue, pelvic pain, indigestion and urinary frequency. The CA 125 and ultrasound testing used in women with suspicious ovarian masses are not good screening tests.