There are many reasons for chest swelling, which need to be analyzed on a case-by-case basis. There are many clinical reasons for breast swelling, such as fluctuations in hormone levels in the body before menstruation, which can cause stimulation of the breast ducts and lead to symptoms of breast swelling, which is a normal physiological phenomenon and does not require treatment. In addition, breast enlargement, breast cancer and other diseases can also lead to chest swelling. Breast swelling is only one symptom, and it is not possible to determine whether you are pregnant based on this one symptom directly. If it is accompanied by symptoms such as menopause, nausea, vomiting, dizziness, weakness and drowsiness, pregnancy is more likely. Women can test with early pregnancy test paper or go to the hospital to have blood drawn about 10 days after intercourse to check the level of blood HCG. Ultrasound examination is also needed to rule out the possibility of ectopic pregnancy after pregnancy is clear. If you have chest swelling you should go to the breast surgery department and get treatment for the cause after perfecting the breast examination. Usually you should choose to wear loose, comfortable and breathable bras and pay attention to breast hygiene.