What Causes Continuous Menstruation?
Persistent or continuous menstruation is an abnormal condition. In most women, the menstrual period lasts approximately 3 to 7 days; bleeding lasting longer than 7 days is considered menorrhagia (prolonged menstrual bleeding). Prolonged or continuous menstruation poses significant health risks and warrants evaluation—typically via pelvic ultrasound—followed by targeted treatment based on the underlying cause. So, what causes persistent menstruation? Below, we address this question.

What Causes Persistent Menstruation?
1. Dysfunctional Uterine Bleeding (DUB)
DUB commonly occurs in adolescent and perimenopausal women. In adolescents, it results from immaturity of the hypothalamic–pituitary–gonadal (HPG) axis; in perimenopausal women, it stems from progressive decline in HPG axis function, leading to diminished ovarian activity.
2. Luteal Phase Deficiency
Insufficient progesterone secretion by the corpus luteum—or premature luteal regression—can delay endometrial development. This condition, known as luteal phase defect, may prolong menstrual duration and increase risks of infertility or miscarriage.

3. Uterine Fibroids
Fibroids located in different uterine regions produce varied symptoms. These may include prolonged menstrual periods and heavy menstrual flow, nocturia or urinary frequency, unexplained constipation, or even a palpable abdominal mass.
4. Other Contributing Factors
Beyond the above causes, environmental changes, excessive physical fatigue, or significant psychological stress can also lead to prolonged or irregular menstrual bleeding. Symptoms often improve with self-care and lifestyle adjustments. However, if abnormal bleeding persists for an extended period, prompt medical evaluation and treatment are essential.
The above outlines the primary causes of persistent menstruation. We hope this information is helpful to you.