For a long time, ovarian cancer was known as the “silent killer” because early symptoms and signs could not be detected. It was not until 2007 that the American Medical Oncology Association published the four major early symptoms of ovarian cancer. The complexity of the early symptoms of ovarian cancer is that all of them can be confused with other common causes of the disease and thus be missed and misdiagnosed. If a patient continues to have the following symptoms for more than two weeks, it should be taken seriously. Abdominal bloating in ovarian cancer patients persists for a long time and does not decrease due to menstruation or OTC medications. The degree of bloating varies from mild bloating to severe bloating. Bloating is often misdiagnosed as other causes: diet, flatulence, constipation and other gastrointestinal problems. Gastrointestinal symptoms can be alleviated by taking OTC medications. 2.Pelvic pain generally speaking physiological pelvic pain will only occur during ovulation and PMS. If the occurrence of pelvic pain is not related to menstruation in any way, then whatever the cause is is an abnormal condition that needs attention. Pelvic pain caused by ovarian cancer is similar to menstrual cramps or even worse, and patients usually need bed rest or medication for relief. When a patient has abnormal pelvic pain, it is important to clarify the pain level. Pelvic pain is often misdiagnosed as other causes: constipation, flatulence, stress, premenstrual syndrome (PMS), irritable bowel syndrome (IBS) and other less severe causes. 3. Eating easily with a feeling of fullness requires attention if the patient often presents a feeling of fullness when eating at a lower-than-everyday amount of food. Note the distinction between a feeling of fullness and poor appetite. The feeling of fullness is easily misdiagnosed as other causes: gastrointestinal discomfort. Statistics from the United States show that ovarian cancer is easily misdiagnosed as gastrointestinal problems in the early stage. 4. Frequent urination, urge to urinate without urination Patients urinate frequently with little change in water intake, or often have a strong urge to urinate but no urination. The above symptoms are easily diagnosed as a urinary tract infection. Patients with urinary tract infections can have their symptoms relieved after anti-infective treatment is given, and if there is no relief, further analysis and examination should be performed. It should be noted that some patients do not have obvious symptoms even when they are diagnosed with ovarian cancer and, at present, most ovarian cancer patients are not detected at an early stage. Since early symptoms of ovarian cancer are common and can be easily misdiagnosed, attention should be paid to the degree and duration of symptoms, and if a certain symptom lasts for more than two weeks without relief, it should be taken seriously. In addition to early symptoms, common symptoms of ovarian cancer include abnormal fullness, unexplained indigestion, flatulence, bloating, painful intercourse, abnormal bleeding, abdominal swelling and pain or no symptoms.