What is the endometrial thickness when menstruation occurs?

Jul 11, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

Under normal circumstances, menstruation occurs when the endometrial thickness reaches 10-12 mm. However, the specific thickness varies among individuals and is influenced by multiple factors, including age, hormone levels, and the phase of the menstrual cycle. If menstruation occurs with an endometrial thickness outside the 10-12 mm range, or if it is accompanied by abnormal menstrual flow or prolonged menstrual periods, timely medical evaluation is recommended.

Generally, endometrial thickness reaches 10-12mm before menstruation occurs; however, the specific thickness varies among individuals and is influenced by multiple factors, including age, hormone levels, and the phase of the menstrual cycle. Detailed analysis is as follows:

Menstruation occurring when endometrial thickness reaches 10mm is commonly seen in older women, especially those approaching perimenopause. During this stage, ovarian function gradually declines, estrogen secretion decreases, and the proliferative capacity of the endometrium weakens. Hormonal fluctuations often trigger endometrial shedding when the thickness reaches approximately 10mm. Additionally, insufficient estrogen secretion caused by conditions such as endocrine disorders may also prevent the endometrium from thickening adequately, resulting in menstruation at around 10mm.

Menstruation occurring when endometrial thickness reaches 12mm typically occurs in women of reproductive age. During this stage, ovarian function is robust and estrogen secretion is sufficient to continuously stimulate endometrial proliferation, allowing it to reach approximately 12mm. Furthermore, in women with regular menstrual cycles and stable hormone levels, the endometrium can fully develop and menstruation usually occurs around 12mm, following a drop in progesterone levels.

If menstruation occurs when endometrial thickness falls outside the 10-12mm range, or is accompanied by abnormal menstrual flow or prolonged menstruation, timely medical evaluation is necessary to rule out endometrial pathologies. Maintaining healthy lifestyle habits, avoiding excessive fatigue and mental stress, can help maintain stable hormone levels and ensure normal endometrial proliferation and shedding.

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Can I take Shensu Cold Tablets during menstruation?

In general, if you catch a cold during menstruation and have normal physical condition without significant dysmenorrhea, Shensu Cold Tablet may be taken. However, those who suffer from severe menstrual pain or have a constitution characterized by cold deficiency should use it cautiously. When having a cold during menstruation, it is important to stay warm and avoid exposure to cold. Drink plenty of warm water and maintain a light, easily digestible diet. Ensure adequate rest, avoid staying up late and strenuous exercise to reduce physical strain.

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What causes a cold during menstruation?

Menstrual colds are mainly caused by immune fluctuations, hormonal changes, pelvic congestion, increased risk of chilling, and accumulated fatigue. If a cold is accompanied by persistent high fever, severe coughing, or symptoms lasting more than three days, prompt medical attention is necessary. During menstruation, women experience metabolic adjustments and a temporary decline in immune cell activity, leading to reduced resistance against viruses and bacteria.