Summary of case history　,Patient Zhang, female, 36 years old , first visited the clinic on December 21st, 2021, whose chief complain was that the right breast nodule was found in physical examination for 2 months. History of Present Illness: The patient went to Fujian Provincial Hospital on October 26th, 2021 for breast color ultrasound examination, which found the right breast hypoechoic nodule, size about 2.8 mm×1.6 mm , BI-RADS category 3. On November 9th, 2021, she went to Fujian Provincial Maternity and Children's Hospital for a reexamination, which showed small nodule in the posterior area of the right areola, about 0.6 cm in diameter, BI-RADS category 3. Due to the enlargement of the breast nodule in a short time, the patient was worried and visited Professor Li Candong's clinic on December 21st, 2021. Professor Li Candong identified the case as Liver-qi stagnation and phlegm-blood stasis, and treated it by soothing the liver and regulating qi, invigorating the spleen and eliminating phlegm, removing blood stasis and dispersing stagnation , and select Modified Chaihu Wendan Decoction as prescription. After taking the prescription, the patient's chest tightness, sleep disorder and premenstrual breast pain were basically relieved, and her menstruation was normal. Moreover, the color ultrasound showed that the breast nodules disappeared. Information Collected with the Four Diagnostic Methods: Chest tightness sometimes, no appetite for meat, light sleep and easy to wake, delayed menstruation, bright red menstrual blood color, accompanied by premenstrual breast swelling, dark red tongue, yellow and greasy tongue coating, deep and slippery pulse. TCM Diagnosis: Ru Pi, Syndrome of Liver-Qi Stagnation and phlegm-blood stasis. TCM Treatment: Soothing liver and regulating qi, invigorating the spleen and eliminating phlegm, removing blood stasis and dispersing stagnation. Western Medicine Diagnosis: Breast nodule. Interventions: Modified Chaihu Wendan Decoction. Curative Effect and Prognosis: The result of reexamination on July 8th, 2022 showed that the patient's breast nodule disappeared and her TCM symptoms basically disappeared.