What are the symptoms of gallstone blockage?

Usually pain. The most common problem is pain in the right upper abdomen after eating and commonly in the middle of the night. It is described as a "balloon" pressure spreading into the back. It lasts hour to days and often causes vomiting or nausea. Attacks can be mild with an upset stomach or nausea or so severe that you think you will die. It often goes into the chest. You need an ultrasound to know.