Menstruation is normal for a few days.

Menstruation time in 2-7 days belong to the normal range, menstruation less than two days is still relatively rare, but less menstrual volume and menstrual period more than 7 days is still relatively common. Menstruation time short or less, may be related to malnutrition, qi stagnation and blood stasis. Menstruation time long may be related to endometrial thickening, endocrine disorders and other reasons.