Hard lumps in the chest that hurt when pressed are usually caused by cystic hyperplasia of the breast, fibroadenoma of the breast and other diseases, and the patient should consult a doctor in time to clarify the cause of the disease. 1. Breast cystic hyperplasia: If the hard lump in the chest that hurts when pressed occurs near the menstrual period and is relieved after menstruation, it should be considered to be caused by breast cystic hyperplasia, and this kind of people should keep their moods happy, carry out appropriate physical exercise, and go to the hospital for regular treatment if necessary. 2. Breast fibroadenoma: Breast fibroblasts are abnormally sensitive to estrogen causing benign breast diseases, patients will have a hard lump in the chest, and there will be pain when pressing, if the fibroadenoma grows up, surgical removal should be considered. 3. Breast cancer: early stage of breast cancer usually shows painless lumps, middle and late stage of breast cancer lumps appear pain, if there is a hard lump in the chest, pain when pressed and at the same time the patient’s armpit also has enlarged lymph nodes, or there are scattered hard skin nodules around the lump, it should be considered as a malignant tumor, and the patient should seek medical treatment in time for surgical treatment and radiotherapy. Hard lumps in the chest that hurt when pressed may also be mastitis and other causes, when the above situation occurs, you should go to the regular hospital in a timely manner, a clear diagnosis and then carry out the appropriate treatment.