Stomach Pain by Ray Sahelian, M.D.

Stomach pain could be a minor, temporary symptom due to a virus or indigestion, or It could point to serious underlying health trouble. Concern arises when the stomach pain contains over days and weeks.

See a doctor if your stomach pain is accompanied by the following symptoms:
Severe pain or regularly recurring pain;
Pain lasting for hours or days;
Stomach pain that wakes you from sleep;
Pain that impairs your ability to work or perform routine activities;
Loss of weight or appetite.

Stomach cancer
Men exposed to certain forms of lead at work face an elevated risk of stomach cancer. The risk is linked to working around organic lead -- mainly in jobs where men are exposed to leaded gasoline in its liquid form -- and to jobs where they breathed in large amounts of gasoline fumes.