Fainting after exercise during menstruation in small children may be due to excessive menstrual flow leading to anemia. Heavy menstrual flow may be a physiological phenomenon of the immature development of the gonadal axis, or it may be due to disease, such as uterine fibroids and endocrine disorders.
1. Physiological phenomenon: when women first start menstruation, the menstrual cycle and the amount of menstruation may be unstable, which is related to the immature development of hypothalamus-pituitary-ovary axis, and some of them may have menstruation only once in a few months and the amount of menstruation is more frequent. Generally, with the maturity of the development of the ovarian axis, the regular menstrual cycle will be established, and the amount of menstruation will also tend to be normalized.
2. Uterine fibroids, uterine fibroids will make the uterine cavity increase in size, the endometrium area increases, which will affect the contraction of the uterus, in addition, uterine fibroids will also make the veins squeezed, resulting in the static plexus from the congestion and expansion caused by the increase in the amount of menstruation.
3. Endocrine disorders: heavy menstruation may also be due to endocrine disorders, endocrine disorders can cause luteal atrophy, or endometrial abnormality with heavy menstruation.
For normal physiological phenomena do not need special treatment, if it is the cause of the disease should be treated as soon as possible, menstruation is recommended to rest, avoid these sports.