Heartburn is reflux (backflow) of the stomach contents into the esophagus, causing burning and discomfort.
The organ affected by bloating and gases is the stomach.
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The lung is one organ that is affected.
Heartburn is a misnomer because it has nothing to do with the heart. It is a burning sensation that is felt in the region of the heart but actually occurs in the esophagus.
Affected by?
That will vary from disease to disease and organ to organ.
I think the first organ to be affected by alcohol is your liver.
Lung.
Your skin
kidneys
Spleen
Liver