What is the normal thickness of the endometrium?

Jul 11, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

Under normal circumstances, the thickness of the endometrium varies at different stages of the menstrual cycle, mainly due to the influence of female hormone levels, typically ranging from 2 to 15 mm. Abnormally thick or thin endometrium may be associated with certain diseases, such as endometrial polyps, endometrial hyperplasia, endometrial cancer, and polycystic ovary syndrome (PCOS).

Under normal circumstances, the thickness of the endometrium varies at different stages of the menstrual cycle, primarily influenced by female hormone levels, and typically ranges between 2-15 mm. A detailed analysis is as follows:

During menstruation, the endometrium sheds and is expelled from the body, with a typical thickness of 2-4 mm. During the secretory phase, corresponding to the luteal phase, the endometrium continues to thicken due to the secretion of progesterone and estrogen by the corpus luteum, potentially reaching 10 mm or more, usually ranging from 10-15 mm. Just before menstruation begins, the endometrial thickness is generally 8-10 mm. Subsequently, during menstruation, a sharp decline in estrogen and progesterone levels leads to shedding of the endometrium, significantly reducing its thickness.

Abnormally thick or thin endometrium may be associated with certain diseases, such as endometrial polyps, endometrial hyperplasia, endometrial cancer, and polycystic ovary syndrome. When evaluating whether endometrial thickness is normal, a comprehensive consideration should be given to a woman's specific physiological cycle and accompanying symptoms.

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What is the normal thickness of the endometrium during the ovulation period?

Under normal circumstances, an endometrial thickness of 8-12 mm during the ovulation period is considered normal. It is important to regularly monitor whether the menstrual cycle is regular. If abnormalities such as unusual menstrual flow or prolonged menstruation occur, timely medical evaluation is necessary. Maintain a regular sleep schedule and avoid staying up late, as this can affect hormone levels. Eat a balanced diet and reduce the intake of spicy and irritating foods to provide a healthy environment for the endometrium.

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Why is my menstrual period delayed by more than ten days if I'm not pregnant?

Under normal circumstances, a menstrual delay of ten days or so without pregnancy may be caused by factors such as chronic mental anxiety, excessive dieting for weight loss, polycystic ovary syndrome (PCOS), hyperprolactinemia, thin endometrium, and others. It is recommended to seek timely medical consultation to determine the underlying cause and receive appropriate treatment under a doctor's guidance. Additionally, maintaining regular作息 (作息 should be translated as "daily routines") and avoiding excessive fatigue are advised in daily life.

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How long does it take for a fertilized egg to implant?

Under normal circumstances, it usually takes 6-8 days for the fertilized egg to complete implantation after its formation. The exact timing can be influenced by factors such as the development speed of the fertilized egg, fallopian tube function, and the condition of the endometrium. There may be slight individual variations, but most fall within this time range. In daily life, individuals preparing for pregnancy do not need to deliberately monitor the implantation timing, as excessive focus on it may instead increase psychological stress.

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What does it mean when a fertilized egg implants?

Under normal circumstances, embryo implantation refers to the process after fertilization, where the fertilized egg undergoes a certain period of cell division and development in the fallopian tube, subsequently entering the uterine cavity and finding a suitable location on the endometrium through a series of complex physiological processes. Additionally, it is important to maintain a positive mindset and avoid excessive anxiety during the implantation period; consumption of spicy and irritating foods should also be reduced.