"Stomach tightness in early pregnancy can also be caused by a miscarriage. If a miscarriage occurs, it is usually accompanied by spotting or bleeding. This condition should be immediately brought to the attention of a doctor. 'Stomach tightness that needs to be watched out for is when it is accompanied by spotting or bleeding, or when there is tissue coming out of the female genitalia accompanied by pain or cramps in the lower back,' said Dr. Anita."

Pain in the round ligament, quoted from the UK National Health Service, is also one of the reasons why the stomach feels tight during pregnancy. This condition often occurs in mothers during the second trimester of pregnancy. The stomach feels tight because the size of the fetus is getting bigger and potentially pressing on the walls of the stomach, causing complaints of a tight stomach.