The black color of the uncomfortable stomach after menstruation is related to cold, endocrine disorders and pregnancy. 1. Cold: If a woman consumes cold drinks, popsicles, or gets wet during the pre-menstrual period or the menstrual period, she will get cold, which in turn affects the normal discharge of menstrual blood and results in blackened menstrual blood, abdominal pain, and other discomforts. 2. Endocrine disorders: If a woman works under pressure, stays up late at night or suffers from gynecological endocrine diseases such as polycystic ovary syndrome or premature ovarian failure, the endocrine disorders will lead to irregularities in ovulation, resulting in low menstrual flow, dark color, abdominal pain and other discomforts. 3. Pregnancy: For women of childbearing age who are not using contraception, it is also important to be alert to the occurrence of miscarriages, ectopic pregnancy and other undesirable pregnancies, due to the lack of female corpus luteum function or fertilized eggs in the fallopian tubes, the woman will experience a small amount of vaginal bleeding, black color, abdominal pain and other discomforts. Women who have black stomach discomfort after menstruation are advised to go to the gynecology department of regular hospitals to improve the blood HCG, ultrasound and other relevant examinations, and to clarify the cause of the disease and then actively treat it under the guidance of the doctor.