### Chinese: 生理期前由于子宫充血和前列腺素释放过多，容易拉肚子。
### English: Pre-physiological period due to uterine blood filling and excessive release of prostate, it is easy to pull the stomach.
### Errors: There is a major error at "Pre-physiological period". There is a major error at "blood filling". There is a major error at "prostate". There is a major error at "to pull the stomach".

### Improved English: It is easy to have diarrhea before the period due to uterine congestion and excessive prostaglandin release.