Breast swelling and pain the day after intercourse, if it happens only occasionally, may be related to local stimulation of the breast, if it occurs frequently, it is necessary to exclude breast enlargement, breast fibroids and other diseases. Common causes and treatments 1, local stimulation of the breast: If the breast is over-stimulated, breast swelling and pain can occur. At this time, you can first observe, generally the symptoms will gradually reduce to disappear, do not worry too much; 2, breast disease: such as breast hyperplasia, breast fibroids, etc., in addition to swelling and pain, can be accompanied by nodules and lumps. There are many causes of breast enlargement, such as poor mental condition, hormone level disorders, at this time, you should go to the hospital to perform breast ultrasound, mammography, hormone and other tests to confirm the diagnosis; according to different causes to take targeted treatment. Patients should pay attention to maintain a good mood, avoid frustration, depression and other bad emotions, so as not to be detrimental to recovery. Note patients should usually wear appropriate loose underwear, do not wear too tight, so as not to affect the local blood circulation in the breast. In daily life, patients should have a diversified diet and can consume more fresh fruits and vegetables, such as oranges, grapes, peaches, tomatoes, carrots, etc.