Although it is difficult to make a definitive diagnosis before surgery, strumal ovarian carcinoid presents the characteristics of PYY peptide release, endocrine dysfunction, steroid hormone secretion, etc. Therefore, for female patients with chronic habitual constipation, abdominal cramps, diarrhea, and menstrual abnormalities, the occurrence of this rare ovarian malignant tumor should be considered. This evidence concerns the gene PYY and ovarian cancer.