For many, the rich food, abundant alcohol, weight gain and stress of the holidays likely lead to one thing: heartburn. But new research finds that an increasing number of people struggle with the burning and pressure of surging stomach acid all year long.
A new study reports that the number of people who frequently experience symptoms of heartburn, also called acid reflux, has almost doubled in the past decade. Acid reflux can mean more than just discomfort -- too much surging stomach acid can create a web of scars in the esophagus, causing food to get stuck on its way down. Research also has connected acid reflux with an increased risk of esophageal cancer, particularly if it is chronic and untreated.
Researchers in Norway followed a group of nearly 30,000 Norwegians from 1995 until 2009, tracking their responses to a national health survey. They found that the number of people reporting symptoms of acid reflux at least once a week ballooned from 31 percent at the study's beginning to 40 percent by the end, an increase of 30 percent. Responders reporting severe acid reflux rose by 24 percent, from 5 percent in 1995 to nearly 7 percent in 2009.
Women seemed to be more affected by the disease than men, and acid reflux became more common in people of both sexes as they crept toward middle age.
"For these people, their quality of life is majorly affected," said study author Dr. Eivind Ness-Jensen, a gastroenterologist at Levanger Hospital in Norway. "Maybe more alarming is that the symptoms are associated with esophageal cancer."
In 2006, a study from the Mayo Clinic found that 5 percent of people with acid reflux developed Barrett's esophagus, a condition that may be a precursor of esophageal cancer. Although esophageal cancer is far less common than other cancers, it is particularly fatal. According to the National Cancer Institute, there were nearly 17,000 new cases of esophageal cancer in the U.S. in 2011, and nearly 15,000 deaths as a result of the disease. Writer Christopher Hitchens died of complications from esophageal cancer last Thursday.
Ness-Jensen said he attributes rising numbers of acid reflux cases to expanding waistlines and increasing obesity, in Norway and other Western countries.
"It's purely mechanical in one way. Added weight increases the pressure between the stomach and esophagus," forcing stomach acid back up, Ness-Jensen said. "There's an increasing weight in the population. That's probably the most important factor."
Obesity is a familiar problem for Americans, and doctors say it's not hard to imagine that the obesity epidemic has caused a similar surge in acid reflux in the U.S. According to the American College of Gastroenterology, 60 million Americans report having heartburn at least once a month, and some studies report that more than 15 million Americans have symptoms every day.
"Let's not mince words: Americans have gotten a lot fatter over the last 10 years. Acid reflux is just one of the many ways we're paying for that," said Dr. Lee Green, a family physician at the University of Michigan. "Part of that is that we are much more aware of it and diagnose it more readily. But that said, I think there really is more of it also."