The aim of this cross-sectional study is to describe the specific situations of thromboembolic disease in gynecological surgery and identify the risk factors of it.

The electronic medical data of 54 patients who undergo operations to treat gynecological diseases but develop thromboembolic disease will be analyzed retrospectively in this study. The location, symptom and other situations of embolism will be described and multiple linear analyse will be employed to identify the risk factors of it.

Inclusion Criteria:

1. Volunteer to participate in the study with informed consent;
2. Females aged 20-80 who are confirmed with some gynecological diseases and are treated with surgery but embolism happens unfortunately.

Exclusion Criteria:

1. Pregnancy, lactation, postmenopause, or planned pregnancy within two years;
2. Patients with blood diseases prone to thrombosis and those with a history of thrombus were excluded;
3. History of hyperparathyroidism, infectious diseases (tuberculosis, AIDS), autoimmune diseases, or digestive system diseases (malabsorption, crohn disease and dysentery);
4. Other diseases or heavy injuries that will interfere with the results;
5. Simultaneous participation in another clinical study with investigational medicinal product(s) or researcher thinks the subjects are not suitable for this trial.

The planned sample size was based on data from a previous study, in which the standard deviation was 5. We assumed an one-tailed α error of 0.05 and a sampling error of 1.0. we propose to enroll 60 participants and allow for a dropout rate of 10% for an effective sample size of 54.