There are various possible causes of breast swelling and painful menstrual delay for 6 days, including pregnancy, normal menstrual delay, endocrine disorders, etc., which need to be identified to facilitate targeted treatment. Common causes and treatment 1, pregnancy: after pregnancy the secretion of sex hormones in the body increases, resulting in localized breast swelling and pain, and menstruation does not come, usually with a recent history of sexual life. Some people may have early pregnancy reaction, such as dizziness, nausea, etc. Early pregnancy test paper can be used to test the HCG in the morning urine, a positive result is considered pregnancy, vaginal ultrasound found embryonic buds can be confirmed, pregnancy should be regular maternity checkups; 2, normal menstrual delay: the menstrual cycle is about 28-35 days, there may be a delay, the appearance of breast swelling and pain, may indicate that the body hormone level has begun to change, menstruation may come within a few days. If there are no other symptoms, there is no need to worry, just observe the appearance of menstruation; 3. Endocrine disorders: If estrogen secretion is relatively more, and progesterone secretion is relatively less, breast swelling and pain and delayed menstruation can have various causes, such as emotional excitement, poor nutrition, endocrine gland diseases, etc. If necessary, hormone level examination should be performed to find out whether it is an organic or functional lesion, so as to eliminate the cause as soon as possible. 4. Ultrasound can be used to make a preliminary judgment. Do not squeeze your breasts at will or blindly believe in breast massage in physiotherapy stores, but seek medical advice to identify the cause. Once menstruation is detected or early pregnancy is diagnosed, sexual intercourse should be avoided.