Human chorionic gonadotropin is HCG. Elevated HCG may be caused by malignant tumors, such as ovarian cancer, gestational trophoblastic tumors, etc. It may also be caused by chylothorax and pregnancy. 1. Malignant tumors: malignant tumors of primary germ cells of the ovary, erosive gravidarum secondary to gravidarum pregnancy, choriocarcinoma, etc. will have trophoblastic differentiation and show elevated HCG values, which are usually higher, and HCG values are usually as high as a few tens of thousands to more than a hundred thousand. In addition, some other malignant tumors, such as lung, adrenal gland and liver tumors will also produce HCG, which will be elevated to different degrees. 2. Grape fetus: Grape fetus is formed due to the development of abnormal fertilized egg, including complete and partial grapes fetus, there will be an abnormal increase in HCG level, but this increase is a persistent increase, there will be no decline, and it can be as high as more than one hundred thousand or even more than two hundred thousand. 3. Pregnancy: under normal circumstances, after pregnancy, the trophoblast will release HCG after the fertilized egg is deposited, and then it will double every 1.7~2 days, reaching 100U/L after 14 days of ovulation, and peak at 8~10 weeks of pregnancy, about 50,000~100,000U/L, and in the late stage of pregnancy, the value is 10% of that of the peak, and it will be back to normal after 2 weeks of delivery. To sum up, HCG elevation has more reasons, can not be determined by this one test result is a malignant tumor, it is recommended that patients seek timely medical treatment, improve the relevant examination, under the guidance of professional doctors to clarify the diagnosis, targeted treatment, so as not to delay the condition.