Gastroesophageal reflux disease (GERD) can be dangerous if left untreated over a long period. Chronic acid reflux can lead to complications such as esophagitis (inflammation of the esophagus), strictures (narrowing of the esophagus), Barrett’s esophagus, and, in severe cases, an increased risk of esophageal cancer. Early management and treatment of GERD can help prevent these complications.