Most often, your doctor can diagnose LPR by examining your throat and vocal cords with a rigid or flexible telescope. The voice box is typically red, irritated, and swollen from acid reflux damage. This swelling and inflammation will eventually resolve with medical treatment, although it may take a few months.

At other times, you may have to undergo a dual-channel pH probe test to diagnose your condition. This involves placing a small tube (catheter) through your nose and down into your swallowing passage (esophagus). The catheter is worn for a 24-hour period and measures the amount of acid that refluxes into your throat. This test is not often necessary but can provide critical information in certain cases.