What causes black menstrual blood on the first day of the period?
Jul 30, 2024
Source: Cainiu Health
Dr. Zhao Xiaodong
Introduction
In general, black menstrual blood on the first day of menstruation may be caused by factors such as blood oxidation, hormonal fluctuations, endometritis, endometriosis, or uterine fibroids. It is recommended to seek medical attention promptly, identify the underlying cause, and receive appropriate treatment under the guidance of a qualified physician. In daily life, avoid consuming raw, cold, spicy, or other irritating foods to prevent interference with menstrual flow.
Generally, black menstrual blood on the first day of menstruation may be caused by factors such as blood oxidation, cyclical regulation, endometritis, endometriosis, or uterine fibroids. It is recommended to seek medical attention promptly, identify the underlying cause, and receive symptomatic treatment under the guidance of a qualified physician. Specific analyses are as follows:
1. Blood Oxidation
At the beginning of menstruation, the shed endometrial blood may remain in the body for a prolonged period. When exposed to air, the blood oxidizes, causing its color to darken and gradually turn deep red or even nearly black. This is a normal physiological phenomenon that does not require special treatment. Maintaining good personal hygiene, regularly changing sanitary pads, or using menstrual cups can help reduce bacterial growth.
2. Cyclical Regulation
In the early phase of menstruation, the shedding of the endometrium may occur slowly, resulting in a small amount of menstrual flow with a darker, almost black appearance. This is a normal physiological change and does not require specific intervention. Maintaining a healthy lifestyle—including balanced nutrition and adequate rest—can help stabilize the menstrual cycle.
3. Endometritis
Endometritis may result from poor personal hygiene, low estrogen levels, or other factors. Inflammation can lead to endometrial congestion and edema, impairing the discharge of menstrual blood and causing it to appear black. Symptoms may include abdominal pain, fever, and increased vaginal discharge. Treatment may involve medications such as levofloxacin hydrochloride tablets, amoxicillin capsules, or metronidazole tablets, as prescribed by a doctor.
4. Endometriosis
Endometriosis may be caused by genetic factors or immune system dysfunction. During menstruation, ectopic endometrial tissue may bleed, but the blood cannot exit through the cervix and instead accumulates within the uterus, potentially turning dark or black. Patients may experience symptoms such as dysmenorrhea (painful periods) or painful intercourse. Under medical supervision, medications such as ibuprofen sustained-release capsules, danazol capsules, or gestrinone capsules may be used to alleviate symptoms.
5. Uterine Fibroids
Uterine fibroids may arise due to genetic factors or hormonal imbalances. Fibroids may compress the endometrium, impair uterine contractions, and hinder menstrual blood expulsion, leading to the aforementioned symptoms. Additional signs may include increased menstrual flow and prolonged periods. Medical evaluation is necessary, and treatment—either pharmacological or surgical—should be determined based on fibroid size and location, following a doctor's recommendations.
In daily life, avoid consuming raw, cold, spicy, or otherwise irritating foods, as these may interfere with menstrual blood discharge. Additionally, maintain sufficient sleep and a regular作息 (routine) to support stable hormone levels in the body.
