I’ve been asked to re-run my columns about Gastroesophageal Reflux Disease, more commonly known as GERD. Breaking down the term translates to: acid from the stomach (gastro) is found in the tube that connects the mouth and stomach (esophagus) and goes in a backward direction (reflux).
It’s helpful to know the anatomy when trying to understand GERD (top diagram). The esophagus is a muscular tube that contracts in a rhythmic fashion and moves food from the back of the mouth down to the stomach. The esophagus passes through the diaphragm, the muscular dome that separates the chest and abdomen. The diaphragm helps form the lower esophageal sphincter (LES) that acts as a valve to help keep acid in the stomach. Food passes through the LES into the stomach where it is mixed with acid to begin digestion.
It is estimated that between 14 and 20 percent of adults in the U.S. are affected with GERD. These estimates are based on surveys of patients who report heartburn, one of the symptoms of GERD. The current medical definition of GERD is “a condition which develops when the reflux of stomach contents causes troublesome symptoms (i.e., at least two heartburn episodes per week) and/or complications.”
The incidence of GERD is increasing in the United States. The reasons are not quite certain, but it is presumed to be due the rising number of overweight and obese individuals though normal weight folks can have GERD as well.
A Hiatal hernia (bottom diagram) can cause GERD. This condition occurs when the top part of the stomach “herniates” or pushes up through the hole in the diaphragm. When this occurs, the lower esophageal sphincter moves up away from the diaphragm, relaxes, and is not as effective at holding food in the stomach.
Additional risk factors for GERD include low muscular tone of the LES, loss of normal muscular function of the esophagus, excess production of stomach acid, delayed emptying of the stomach, and overeating. Alcohol can reduce the effectiveness of the LES. Fatty or fried foods, coffee, tea, caffeinated drinks, chocolate, and mint are all foods that can cause or worsen GERD. Smoking cigarettes is also a risk factor.
Common symptoms of GERD include heartburn, regurgitation, difficulty swallowing and chest pain. Less common symptoms include pain with swallowing, water brash (excessive salivation prompted by acid reflux), sour brash (acid taste in the mouth, particularly when lying down), pain in the upper abdomen, and nausea.
Most people think of GERD as something that just causes heartburn, but it can result in more serious complications. These can be divided into those that involve the esophagus and those that don’t. While most of these produce only symptoms, some can actually cause injury or even lead to cancer.
The lining of the stomach is protected from stomach acid by a thin layer of mucus. The lining of the esophagus, on the other hand, is not designed to withstand constant exposure to stomach acid. When the esophagus is bathed in gastric juice, it can become inflamed and even ulcerated. This condition is called esophagitis and can vary from mild to severe.
Reflux and esophagitis can cause scarring of the wall of the esophagus. This can result in the formation of narrowed areas called strictures. Strictures may result in difficulty swallowing solids and food may feel like it’s getting stuck in the middle of the chest. If the strictures are severe the person may even have trouble swallowing liquids.
Cells that line the esophagus, when exposed to stomach acid on a frequent basis, may undergo changes to try to protect themselves. Excess acid exposure can also result in a condition called Barrett’s esophagus. People with this condition can develop cancer of the esophagus. The chance is about one-half to three quarters of a percent each year. The incidence of cancer of the esophagus has increased by a factor of two to six over the last 20 years.
There are also complications of GERD that occur outside the esophagus. If the stomach acid gets high enough in the esophagus, it can spill over into the larynx (voice box) and trachea (windpipe). This can cause a dry cough and also inflammation of the larynx (laryngitis) resulting in hoarseness and an irritating need to clear the throat. It can also make asthma more difficult to treat. Excess acid can also cause tooth decay.
Now that you’re an expert in what GERD is, you’re probably asking how to avoid getting it and how to diagnose complications and treat it. Tune in next week for the exciting conclusion!