Stomach acid, also known as gastric acid, is a colorless, watery fluid generated by the lining of the stomach. It is very acidic and aids digestion by breaking down food. This makes it easier for your body to absorb nutrients as food passes through your digestive tract. The acidity of stomach acid is measured on a scale called pH. The pH of stomach acid is 1-3. You need acid to break down foods so they can be used by your body as energy sources. Too much acid in the stomach can lead to inflammation of the stomach (gastritis). This is when the acid burns or irritates the stomach lining causing pain, diarrhea, and vomiting. Stomach acid is needed to help digest certain foods such as meat, eggs, and beans. It also helps destroy bacteria that may enter the stomach through eating. However, too much acid or an imbalance between acid and alkaline minerals in the body can cause problems with bones, teeth, muscles, and nerves. Overall, healthy levels of acid are necessary for good health. Too little acid and you're at risk for developing conditions such as osteoporosis and kidney stones. Too much acid and you risk developing issues such as esophageal cancer and gastrointestinal disorders. Acid reflux disease (ARD) is the most common problem with acidity levels in the body.