The swollen lymph nodes in the armpits are as painful as eggs, and the pain in the breasts may be caused by acute mastitis, mastitis, and ductal inflammation. 1. Acute mastitis: When accompanied by bacterial infection, inflammation can lead to breast pain, which may involve the paratesticular breasts, and can cause axillary lymph nodes to swell. 2. Paramastitis: under the stimulation of inflammatory factors, it can cause pain in the paratesticular breast, and in severe cases, it can lead to swelling of the lymph nodes in the armpit. 3. Mastoiditis: Early symptoms such as breast redness, swelling, heat and pain can occur, which can involve the paratesticular breasts and cause pain, and in severe cases, cause axillary lymphadenitis, which can lead to swollen lymph nodes in the armpits. It is recommended that those who have swollen lymph nodes in the armpit as painful as eggs and pain in the paratesticular breasts should go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.