Acute mastitis is a common disease in women during breastfeeding, mostly occurring during the puerperium of first-time mothers. It is not self-healing and should be treated promptly. There are three periods of acute mastitis, each with different symptoms. 1. Breast lump phase: This is the early stage of acute mastitis. In this stage, the patient usually feels a swollen and painful breast, a lump to the touch, and a slight fever. This period is usually caused by milk stagnation, which is commonly known as milk blockage. If you can take active and effective treatment during this stage, such as massage to unblock, you will recover soon. 2. Cellulitis stage: This stage is when mastitis has developed to the middle stage. At this stage, the patient will feel more pronounced and intense breast swelling and pain, and the lumps will become harder and larger to the touch. The lymph in the armpit may also be significantly enlarged to the touch. The fever and fever become more frequent and the body temperature becomes higher. This stage should be treated mainly with medication, a combination of anti-inflammatory drugs and Chinese medicine, which can also be cured. 3, abscess formation period: this period has been the development of acute mastitis to late symptoms, this period is the formation of breast abscess period. Patients feel the lumps of the breast appearing wavy, especially the shallow abscesses, and can feel the obvious fluctuations. In the period of abscess formation, if treatment is taken, if the amount of abscess is small, you can first try puncture and pus aspiration, together with the characteristic treatment of Chinese medicine, which will generally also cure, but if the amount of abscess is large, or if puncture and pus aspiration is not effective, then incision and drainage surgery is required. Although acute mastitis is a relatively common puerperal disease, it can be completely prevented by prevention, and I hope you will pay enough attention to it.