1.Simple cyst: it is the most common among breast cysts, mainly due to endocrine disorders causing ductal epithelial proliferation and increased cells in the ducts, resulting in duct extension, tortuous, folding, and necrosis of the duct wall at the fold due to ischemia, forming cysts. The disease is common in middle-aged women, and the main symptom is the formation of ovoid breast lumps, which can be solitary or multiple. The cysts can be single or multiple. In the case of single lump, the lump often grows rapidly and is easily confused with breast cancer. 2.Cumulative breast cysts: also known as milk retention cysts, are less common than simple cysts, mainly due to the blockage of a duct during lactation, causing milk stasis and forming cysts. Cysts can be seen in any part of the breast, but are most common in the deep part of the breast. The disease is most common in women of childbearing age, often occurring during or after pregnancy and lactation, with breast lumps as the main clinical symptom. 3, retention cysts: that is, a large number of fluid accumulation cysts.