Ovarian cancer is a malignant tumor occurring in ovary, and there are no specific clinical symptoms in early stage, so early detection is difficult. As the disease progresses, the following specific symptoms can appear: 1. Abdominal distension and abdominal pain: abdominal distension is mostly caused by abdominal fluid accumulation due to tumor, enlarged pelvic mass as well as progressive enlargement of abdominal circumference caused by gastrointestinal tract compression. Abdominal pain can be caused by rapid growth of the tumor leading to intratumoral hemorrhage or acute abdominal pain caused by tumor rupture or tumor torsion; it may also be caused by the increasing volume of the tumor pulling on the peritoneum, which produces chronic abdominal dullness and pain. Decrease in appetite and blood in stool: the tumor may compress the gastrointestinal tract or metastasize the gastrointestinal tract, thus causing decrease in appetite; it may also be caused by the tumor or the humoral factors secreted by the body; when it invades into the rectal mucosa, it may cause blood in stool. Abdominal mass: when the tumor is large in size, the patient can find a mass in the lower abdomen; sometimes a hard mass can also be found in the middle abdomen. 4. Chest tightness and breathlessness: when the tumor metastasis causes pleural effusion, it may cause chest tightness and breathlessness. Frequent urination: the tumor enlargement may cause frequent urination when it presses the bladder. Intestinal obstruction: If the tumor presses the intestinal tract or mesenteric infiltration occurs, it can lead to intestinal obstruction, which manifests as nausea, vomiting, abdominal pain, abdominal distension, and stopping of defecation and elimination of gas. 7. Postmenopausal vaginal bleeding: some ovarian cancers have the function of secretion of estrogen, which can lead to vaginal bleeding in postmenopausal ovarian cancer patients. To summarize, early symptoms of ovarian cancer patients are hard to be found. With the progress of disease, cancer cells can be transferred to different parts of the body, thus causing corresponding symptoms.