Bronchial pain in pregnancy is caused by the increase in intra-abdominal pressure due to the enlargement of the uterus during pregnancy, which compresses the diaphragm. This is a normal physiological phenomenon that occurs in late pregnancy when the fetus increases in size, the uterine fundus rises, and the abdominal space is squeezed, resulting in pressure on the stomach and intestines. If the pain is more pronounced after a bout, you can hold your breath and take a sip of water. You can also do local hot compresses or rest in the left side.