Your description of your symptoms may be all a doctor requires to diagnose heartburn, but sometimes additional testing may be necessary. The esophagus can be viewed through an endoscope, a long, thin, flexible tube inserted through the mouth, or by X-ray.
Sometimes, your doctor may recommend a 24-hour esophageal pH probe study, especially if you have unusual symptoms, such as throat or chest or abdominal pain, coughing, or asthma-like symptoms. In this test, a long, narrow, flexible tube is inserted through the nose down into the esophagus and a probe is left there for 24 hours. This probe detects acid levels to determine if it correlates with your symptoms. A newer technique (called Bravo) measures 24-hour acid; it is done using wireless pH sensors, which eliminates the need for a tube insertion. To detect if your heart is the cause of your symptoms, an electrocardiogram (ECG), a recording of the heart's electrical activity, may be taken.
Laryngopharyngeal reflux (LPR) is similar to another condition -- GERD -- that results from the contents of the stomach backing up (reflux). But the symptoms of LPR are often different than those that are typical of gastroesophageal reflux disease (GERD).
With LPR, you may not have the classic symptoms of GERD, such as a burning sensation in your lower chest (heartburn). That's why it can be difficult to diagnose and why it is sometimes called silent reflux.
National Heartburn Alliance.
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Jennifer Robinson, MD on August 26, 2014