At 17 years old in the developmental stage, the phenomenon of hard lumps in the grasping breast, if not accompanied by pain, swelling and other symptoms, usually caused by elevated estrogen in the body, may be a normal breast gland. In addition, it may also be related to a variety of diseases such as mastopexy, mastitis, breast fibroadenoma, breast cancer, etc.: 1. Mastopexy: usually caused by endocrine disorders, is a benign proliferative disease, the main symptom is the appearance of lumps in the breast, which can be accompanied by symptoms such as swelling and pain. If the patient is a 17-year-old woman, the pain symptoms may also worsen before menstruation. The pain can be relieved by drugs such as tamoxifen citrate tablets under the guidance of a professional doctor, but there are certain side effects and it does not have a curative effect on the disease and should not be taken for a long time; 2. Mastitis: it is common in women and is usually related to bacterial infection, trauma and other factors. It can be manifested as a local lump or pus in the breast, characterized by chronic infection, which is not easily cured. If the symptoms are mild, you can follow the doctor’s advice to choose suitable antibiotic treatment, such as penicillin, erythromycin, cephalosporins, etc. If the lump is obvious and accompanied by pain, redness, swelling, fever and other symptoms, surgical incision and drainage can be considered. 3. Breast fibroadenoma: Mostly found in young women, it is a benign disease of the breast, usually caused by abnormal levels of estrogen receptors contained in breast fibroblasts. The main manifestation is the appearance of breast lumps, which are hard and spherical in texture, usually without obvious symptoms such as pain, and do not change with menstruation, which can lead to the phenomenon of hard lumps in 17-year-old patients who grasp and pinch their breasts. If the size of the mass is small, conservative treatment such as regular follow-ups and application of medications can be chosen. If the mass is larger or growing rapidly, it should be treated by traditional surgery, minimally invasive rotational excision and microwave radiofrequency ablation based on professional doctor’s diagnosis. 4. Breast cancer: mainly includes non-invasive cancer, invasive cancer, and rare cancer such as spindle cell carcinoma. The causes of the disease may be related to genetics, long-term poor dietary habits and other factors. Early symptoms are mainly lumps in the breast, breast overflow, abnormal breast skin and other symptoms, and with the development of the disease, symptoms such as anorexia, weakness, anemia and headache may also appear. Surgery is the main treatment for this disease, mainly including breast conservation surgery, total mastectomy, etc. It can also be combined with chemotherapy, endocrine therapy, targeted therapy, and post-operative radiotherapy. For advanced patients who cannot afford surgery or do not have indications for surgery, palliative radiotherapy can be administered to help improve the quality of patient survival. For 17-year-old patients with hard lumps inside their breasts once they are grasped and pinched, they can be observed first, and if abnormal manifestations such as pain and increased volume of hard lumps occur, it is recommended to seek medical attention for targeted treatment. In addition, daily attention should be paid to relieving their own stress, pay attention to rest, avoid staying up late, appropriate exercise, and a light diet, which can help the health of the body.