### 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: It is easy to have diarrhea before menstruation due to uterine hyperemia and excessive prostaglandin release.
### Errors: There is no error in the English translation.

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