A bit of swelling and pain in the chest may be related to cystic hyperplasia of the breast, acute mastitis, lymphangitis of the chest wall and other causes. 1. Breast cystic hyperplasia: When the hormone level in the body is imbalanced, it makes the breast tissue overgrow, and the symptoms of breast swelling, tingling, and breast lumps can be touched. When menstruation comes or ends, the symptoms improve significantly or even disappear. 2. Acute mastitis: When the milk ducts are blocked, bacteria invasion can lead to acute mastitis. At this time, you can take oral antibiotic medication in time, and at the same time, you need to avoid the mammary glands to be squeezed and impacted, pay attention to the local hygiene of the breast, so as not to aggravate the symptoms. 3. Chest wall lymphadenitis: When lymphadenitis occurs, it can block the lymphatic return, resulting in the stagnation of tissue fluid that is not transported in time, which can lead to chest swelling and pain. It is recommended to go to the hospital in time, after clarifying the cause of the disease, symptomatic treatment.