Burning Sensation

• One of the most common symptoms of acid indigestion is a burning sensation around the area of the stomach or abdomen.
  
  

Pain or Discomfort

• More often than not, the burning sensation due to acid indigestion will bring a certain amount of pain or discomfort to the abdominal region.
  
  

Gas

• Most people suffering from acid indigestion will also experience some gas, which would include both flatulence and burping, as well as bloating.
  
  

Nausea

• Many people suffering from acid indigestion will also experience nausea or an upset stomach. This may prompt some vomiting or a loss of appetite.
  
  

Sour Taste

• Since acid indigestion is due to condition involving a person's digestion, most sufferers will also experience an almost acidic or sour taste toward the back of their mouth.
  
  

Heartburn

• Though not an actual symptom of acid indigestion, most people dealing with this digestive state will also suffer from heartburn, which brings with it a burning sensation of its own located in the chest and sometime up into the throat.