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A burn is damage to your body's tissues caused by heat, chemicals, electricity, sunlight, or radiation. Scalds from hot liquids and steam, building fires and flammable liquids and gases are the most common causes of burns. Another kind is an inhalation injury, caused by breathing smoke. There are three types of burns:
One common cause of heartburn is the condition acid reflux. 1  Acid reflux is the flow of stomach acid into a personâs esophagus, which can cause a burning sensation in the chest. Other causes of heartburn are: 2  Eating meals too quickly. 3  Pregnancy. 4  Alcohol. 5  Fatty and greasy foods.