There is usually nothing abnormal by menstrual color alone and no other symptoms. If you are more nervous, you can wait until your menstruation is clean and go to the Obstetrics and Gynecology Department of a regular hospital for gynecological examination, routine white belt examination, gynecological ultrasound to find out if there are any abnormalities in the uterine adnexa, and eventually combine it with past fertility history and medical history to make a clear diagnosis. Chinese medicine can infer from the fact that menstruation is very thin and not red like water that the patient may have Qi and blood deficiency. The causes of Qi and blood deficiency are common: 1. too many births and improper postpartum conditioning leading to relative weakness of Qi and blood; 2. poor transport and transformation of the spleen and stomach leading to Qi and blood deficiency; 3. long menstrual periods and excessive menstrual flow leading to relative deficiency of Qi and blood.