Ovarian cancer tumor can be big or small, mainly according to the type of tumor and judged according to the early or late discovery of the tumor. Normal ovary size is 4cm×3cm×1cm, which is located deep in normal female pelvis. Occasionally, when doing other surgeries, it is found that there is something wrong with the ovary, and a small piece of the ovary is cut off for pathological tests to find out the very early cancer, but this situation is relatively rare because the ovary is located deep in the pelvis, which makes it difficult to find out early, and most of the discoveries are made at a late stage with a large tumor. Most benign tumors grow slowly, but when ovarian cancer is found in middle or late stage, it is accompanied by ascites and other metastatic symptoms. Therefore, as ovarian cancer varies in size, clinic must do regular gynecological examination, including ultrasound, gynecological examination, and even blood tumor marker test, which can help to detect ovarian cancer at an early stage.