Endometrial thickening is a symptom. The thickness of the endometrium will be affected by hormones and change periodically. Physiological thickening is not a cause for concern. Pathological endometrial thickening can be treated with traditional Chinese medicine under the supervision of a medical doctor if symptoms occur. Endometrial thickening is a Western medical concept, mostly caused by stagnation of blood and qi, stagnation in the uterus, which can be attributed to Chinese medicine “dysmenorrhea”, “excessive menstruation”, “infertility” and other conditions. Common causes include qi stagnation and blood stasis (stagnation of blood due to lack of circulation of qi), qi deficiency and blood stasis, and cold and blood stasis. For Qi stagnation and blood stasis, use Diaphragm Under Blood Stasis Relief Tang to invigorate blood circulation, remove blood stasis, move Qi and relieve pain (relieve pain by regulating the body’s Qi), including Angelica sinensis, Radix Paeoniae Alba, Rhizoma Ligustici Chuanxiong, Peach kernel, Safflower, Citrus aurantium dulcis, Yuanhu, Lingzhi, Dampyi, Wu yao (乌药), Xiangshu (香附), and Roasted Licorice. Use with caution for pregnant women. Pregnant women are advised to use with caution. The above medicines should be taken under the guidance of a medical practitioner, and should not be used on one’s own. If you feel unwell, please consult a doctor promptly.