Chest tightness in early pregnancy is a common cause of heartburn, indigestion, stress and physical changes. Heartburn or acid reflux is quite a common condition during pregnancy, if this is caused by this condition, chest tightness is most severe and noticeable after a pregnant woman has eaten, heartburn may cause the patient to have a burning or warming sensation in the chest accompanied by pain, and in severe cases it may lead to inflammation of the throat. Stress refers to excessive worrying of the pregnant woman during pregnancy, too much worrying can also lead to chest tightness in pregnant women, due to the fact that the body’s functions are adjusting and even growing throughout the pregnancy, some of these changes can also lead to chest tightness in pregnant women.