pain radiating to the jaw, neck or arm Chest pain on exertion or with stress Causes Indigestion has many possible causes.
[mayoclinic.org]
If indigestion is unusual, accompanied by shortness of breath, sweating, chest pain, or pain radiating to the jaw, neck, or arm, seek medical attention immediately.
[webmd.com]
Trouble swallowing that gets progressively worse Fatigue or weakness, which may indicate anemia Seek immediate medical attention if you have: Shortness of breath, sweating or chest
[mayoclinic.org]