Glycoantigen 12-5, or glycoantigen CA12-5, or CA12-5 for short, is a glycoprotein located in the epithelial cells of the corpora cavernosa. If a woman has a high CA12-5 in early pregnancy or during menstruation, and if it is not accompanied by other physical symptoms, it is usually normal and does not require special treatment. However, if it is accompanied by uncomfortable symptoms or if the elevation is obvious, it should be considered to be caused by pathological factors: 1. Mild elevation: CA12-5 is a tumor marker, related to malignant tumors, but not always malignant tumors, other benign diseases can also cause mild elevation of CA12-5. 1. Gynecological diseases: If the patient suffers from chronic pelvic inflammatory disease, adenomyosis, ovarian chocolate cysts, ovarian benign tumors, endometrial tumors, or ovarian cysts, the patient should be considered to have a high CA12-5 level. If the patient suffers from chronic pelvic inflammatory disease, adenomyosis, ovarian chocolate cyst, ovarian benign tumor, endometriosis and other gynecological diseases, it may lead to high CA12-5; 2. Non-gynecological diseases: If the patient suffers from tuberculous peritonitis, hepatitis, pancreatitis and other non-gynecological diseases may also lead to high CA12-5. 2. Significantly elevated: If CA12-5 appears to be significantly elevated, it indicates that the patient may be suffering from tumor, such as pancreatic cancer, stomach cancer, lung cancer, cervical cancer, pancreatic cancer, intestinal cancer, breast cancer, colorectal cancer and other malignant tumor diseases. Therefore, patients with high CA12-5 usually do not have high specificity and cannot be diagnosed based on this indicator. It is recommended to go to the hospital in a timely manner for abdominopelvic ultrasound, CT examination, magnetic resonance examination and other related examinations to clarify the specific cause of the elevation, and if it is caused by disease factors, targeted treatment should be actively carried out to avoid aggravation of the disease.