A ball-like lump inside the chest is usually a lump that is considered to be a breast fibroid if it is mobile, has distinct borders that can be palpated, and has a smooth surface. It is usually solitary, round, flexible and mobile, and may be asymptomatic or occasionally mildly painful to the touch. Surgical excision is the only effective treatment option for this condition, and because of its simplicity, it can be removed during day surgery without hospitalization. In addition, other benign breast growths, breast lipomas, etc., or malignant breast sarcomas may also be found in the breast as a hard, round ball-like mass. In this case, patients are usually advised to undergo ultrasound and mammography. If a lump is found to be fixed with unclear boundaries, it is considered to be possibly related to breast cancer and should be clearly diagnosed by puncture biopsy: I. Benign diseases: 1. Breast hyperplasia: commonly found in female patients, related to menstruation, pregnancy, breastfeeding, emotions and other factors, often with breast swelling and pain as the first symptom, and some patients have periodic breast swelling and pain and nodular hard lumps. Usually, oral administration of prolotherapy and tamoxifen is effective, but no special treatment is needed. 2. Breast lipoma: It is usually painless and is often associated with excessive alcohol consumption, obesity and decreased estrogen levels. Surgery is also the only effective treatment for breast lipoma. At the same time, patients should abstain from alcohol and insist on exercise and weight loss to reduce the burden on the breast. Malignant diseases: 1. Breast sarcoma: it is a rare malignant tumor, and the lump can be pushed and has obvious boundaries, which usually needs to be removed surgically. For those with multiple recurrences or malignant lobular tumors, mastectomy may be considered; 2. Breast cancer: generally the breast lump is hard, not easy to be pushed, and with the development of the disease, it can cause localized breast augmentation, and accompanied by nipple depression of ” The breast lump is usually hard and hard to push, and with the progression of the disease, it may cause localized elevation of the breast, accompanied by “dimple sign” of nipple depression and “orange peel” change of areola skin wrinkling. Surgery is the first choice for early stage breast cancer patients, and postoperative treatment with radiotherapy, chemotherapy and targeted therapy can improve the prognosis of patients by early detection and early treatment.