Can a hernia in your stomach cause an uncomfortable chest feeling, similar to the coming of a heart attack?

May be: Hiatal hernia, where part of the stomach moves into the chest. However; any symptom suggestive of heart attack should not be taken lightly and you should consult your doctor at the earliest.

Hiatal hernia pain: A hiatal hernia (gerd) causes acid to enter the esophagus from the stomach and the acid can cause pain similar to that of the heart not getting enough blood to supply oxygen to it, angina. It can cause patients to be admitted to the hospitals to rule out a heart attack. If one does not chest pain walking around and gets it at night, chances are it is caused by gerd. See a GI doc to diagnose gerd.

Yes, commonly: A hiatal hernia is often associated with reflux of acidic gastric contents into the esophagus which can cause "heartburn" or pain that can be similar to that caused by a heart attack. A para esophageal hernia can allow the stomach to move into the chest. It can twist and cause necrosis or death of the stomach which can cause pain, nausea and vomiting and is a surgical emergency.