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The symptoms of acidity occur when some of the acid content of the stomach flows back up into the esophagus or the food pipe, which connects the mouth to the stomach. Normally, a ring of muscle called the lower esophageal sphincter (LES) acts as a valve that lets food enter the stomach but does not allow it back up into the esophagus. When this valve fails to function properly, stomach contents are regurgitated into the esophagus and the following symptoms of acidity can be experienced:

1. Heartburn

Despite the name, heartburn has nothing to do with the heart. It is a common symptom of acidity that is caused when the excess stomach acid leaks out into the esophagus, leading to a burning sensation in the chest. This feeling can last for a few minutes to several hours. 

2. Regurgitation

Some people with acidity may experience regurgitation. It is a feeling in which the person may feel liquid undigested food, bile, or stomach acid moving up and down in the throat. This sensation is somewhat similar to the feeling of being pukish and usually occurs post meals, exercising, or bending right after eating.

3. Sour taste in the mouth

Another common symptom of stomach ailments, a sour taste in the mouth, is also a symptom of acidity. It happens when food, along with stomach acid and bile, rises up to the back of your throat, causing a bitter taste. This usually happens along with regurgitation.

4. Difficulty in swallowing

Difficulty in swallowing, also known as dysphagia, happens when excess acid in the stomach causes a feeling of fullness. It also causes a delay in the movement of food through the food pipe and impedes digestion.

5. Sore throat

When the stomach acid moves up to the mouth it can irritate the vocal cords or the voice box, leading to sore throat or hoarseness. 

6. Indigestion

Indigestion, also known as dyspepsia, can also be a key sign of acidity and other digestive problems. It can lead to a feeling of discomfort and a burning sensation in the upper middle part of the stomach. 

Heartburn is often confused as a symptom of heart attack.
Read the article to know the difference between angina, heartburn, and heart attack.