13 years old, which is the age when many girls just come to menstruation, and some girls have never even come to menarche. So many girls still don't know the importance of menstruation. So, what is the reason for the lack of black menstruation at the age of 13? What is normal menstruation like? Why do some women have dysmenorrhea?

13-year-old causes of dark menstruation 1, bad living habits. Excessive dieting, some girls go on unscientific dieting in order to lose weight, which leads to malnutrition and endocrine disorders. Excessive work and rest makes women prone to less menstrual flow, because women are stimulated by cold during menstruation, which will cause excessive contraction of blood vessels in the pelvic cavity, resulting in less menstrual flow and even amenorrhea. Eating cold and spicy food often is also an inducement.

2. Too much pressure and a bad mood. I believe many women have experienced the influence of stress and emotion on menstruation. Excessive life pressure, sulking or encountering important soul stimulation and psychological trauma will all cause endocrine disorders, resulting in less menstrual flow for girls.

3. Endometrium itself, such as endometrial tuberculosis, induced abortion or curettage, causes endometrial thinning, which constitutes endometrial trauma and causes intrauterine adhesions. In severe cases, menstruation is as little as amenorrhea.

4, endocrine reasons, such as abnormal secretion of various hormones or ovulation. Or diseases such as tumors and uterine hypoplasia can also cause less menstrual flow and blackening.

5. taking drugs. People who use psychotropic drugs, endocrine agents or intrauterine devices for contraception may have irregular menstruation. Other drugs may also cause this symptom.

Under normal circumstances, women's menstrual blood is dark red. In addition to blood, there are endometrial fragments, cervical mucus and exfoliated vaginal epithelial cells. Some women have less menstrual flow and dark menstrual blood, which may be caused by long-term accumulation of menstrual blood in the uterine cavity.

What is the cause of dysmenorrhea? On the first day of menstruation, many women will have dysmenorrhea. What is dysmenorrhea? Dysmenorrhea is actually some abdominal pain during menstruation. In many cases, once the menstrual period ends, these symptoms will disappear. For dysmenorrhea, many people also know that its harm is not only physical pain, but also may affect future fertility problems and gynecological diseases. So many women have begun to pay attention to dysmenorrhea. So, what is the cause of dysmenorrhea?

(1) Primary dysmenorrhea. Primary dysmenorrhea refers to dysmenorrhea during the first menstrual period. Generally speaking, primary dysmenorrhea is caused by cervical stenosis, indicating that the uterus is not well developed, so there will be some endometrium or blood clots in menstrual blood, which will cause dysmenorrhea.

(2) Secondary dysmenorrhea. Secondary dysmenorrhea refers to dysmenorrhea that gradually appears several years after the initial period of menstrual cramps. Secondary dysmenorrhea often occurs, which is probably caused by some gynecological diseases. For example, there is endometriosis, or some inflammation in the vagina. These are the causes of dysmenorrhea. If there is an increase in prostaglandin in our endometrium, it will also lead to dysmenorrhea. I suggest you go to the hospital for further gynecological examination to find out the cause of dysmenorrhea, and then consider the next treatment.

(3) Dysplasia of uterus can also lead to dysmenorrhea. Uterine dysplasia is most likely to cause abnormal blood supply, leading to uterine ischemia or hypoxia, thus causing dysmenorrhea in women.