Hard lumps in the breast are commonly found in breast hyperplasia, inflammatory diseases, breast cysts, etc. Diagnosis needs to be made in conjunction with auxiliary examinations. A hard lump felt in the breast may be a breast nodule, inflammatory disease of the breast, breast cyst, benign or malignant tumor of the breast, etc. It is occasionally accompanied by vague pain, pressure pain, and in severe cases, fever. There are many diseases that cause hard lumps in the breast, and the causes of hard lumps are also various, so it is difficult to diagnose by this sign alone. It is suggested that patients should observe the hard lumps after finding them. If the hard lumps are in the premenstrual period and disappear with menstruation, it is generally a physiological condition; if the hard lumps gradually increase in size or other signs such as swelling and pain appear, they should go to the breast surgery department of the hospital for examination with breast ultrasound, hormone examination, mammogram and other auxiliary diagnosis, and then follow the doctor’s instructions to carry out the corresponding treatment after confirmation of the diagnosis.