Breast swelling and pain is not necessarily breast cancer because many factors can cause this symptom, such as mastitis during pregnancy and after childbirth due to the accumulation of milk, which can lead to breast swelling and pain. Some patients also suffer from cystic hyperplasia of the breast, which can also lead to breast swelling and pain, so you can’t judge breast cancer simply by whether there is swelling and pain. Breast cancer patients often have the following symptoms, such as localized palpable hard lumps, poor mobility, and uneven surface, which can be clarified by breast ultrasound and mammogram. Sometimes it is also necessary to perform a puncture biopsy of the breast, or remove the mass and then do a pathologic biopsy to be clear. During the examination, patients should not eat too spicy food or drink alcohol, and other precautions can be consulted with the attending physician.