(1), cervical canal stenosis is mainly menstrual outflow obstruction, causing dysmenorrhea.

(2) The development of uterine hypoplasia poor uterine blood supply abnormalities easier to merge, resulting in uterine ischemia, hypoxia caused by dysmenorrhea.

  (3) abnormal position of the uterus if a woman’s uterus after the location of extreme flexion or flexion, may affect the blood unobstructed Erzhi dysmenorrhea.

(4) mental, neurological factors, some women over-sensitive to pain.

(5) genetic factors with the mother daughter dysmenorrhea dysmenorrhea occurs a certain relationship.

(6), endocrine factors, menstrual period abdominal pain and elevated luteal phase progesterone.

(7), endometrium, and menstrual blood prostaglandin (PG) content increased prostaglandin E2 (PGE2) play a role in the uterine muscle fibers to make it contraction dysmenorrhea. The patients with endometrial tissue levels of prostaglandin was significantly higher in normal women.

(8) excessive uterine contraction. Although dysmenorrhea in patients with uterine contraction pressure and the normal women is basically the same (normal pressure is about 4.9Kpa), but the longer the duration of uterine contraction, and often difficult to completely relax, it happened due to excessive uterine contraction-induced dysmenorrhea.

(9) of abnormal uterine contraction. Dysmenorrhea in patients with abnormal uterine contraction often, so often leads to uterine ischemia, uterine muscle ischemia and muscle spasm can also cause uterine contractions, resulting in pain, dysmenorrhea arise.

(10) gynecological diseases such as endometriosis, pelvic inflammatory disease, adenomyosis, uterine fibroids and so on. IUD placed inside the uterus (commonly known as IUD) is also easily cause dysmenorrhea.

(11) girls menarche, psychological stress, sedentary lead to deterioration of blood circulation, blood is running sluggish, eat cold food, etc., causing dysmenorrhea.

(12) menstrual strenuous exercise, affected by cold wet attack, are easy to lead to dysmenorrhea.