Colon Cancer: Leading Cause of Death Under 50

A Silent Epidemic Among Young Adults

Colorectal cancer has become the leading cause of cancer deaths in adults under 50 in the United States. According to the latest data published in the journal CA: A Cancer Journal for Clinicians, this milestone was reached as early as 2023, a full seven years earlier than scientists originally predicted. As recently as 1990, colorectal cancer ranked fifth among causes of cancer mortality in this age group.

For 2026, experts estimate approximately 158,850 new cases in the USA and 55,230 deaths. Of particular concern is that 45 percent of new diagnoses are in people under 65 — a 27 percent increase compared to 1995. The incidence of the disease is also increasing by 3 percent per year in adults aged 20 to 49, with a particularly rapid increase in the incidence of rectal cancer, which now accounts for 32 percent of all colorectal cancer cases.

Why is the Disease Affecting Younger Patients?

Experts warn that the rise is due to a combination of lifestyle factors typical of modern Western society. Key risk factors include:

• Unhealthy diet — high intake of processed meats, fatty foods and sugar, low intake of fiber and vegetables
• Obesity and overweight — a higher body mass index is strongly associated with early onset of the disease, especially in men
• Sedentary lifestyle — physical inactivity increases the risk of developing the tumor
• Alcohol and smoking — both factors demonstrably increase the risk of colorectal cancer

Researchers from the Dana-Farber Cancer Institute point out that these factors are not just an American phenomenon — a similar trend is evident throughout the developed world, including Europe.

Europe and the Czech Republic are No Exception

According to data from the Kolorektum.cz portal, which monitors epidemiology in the Czech Republic and in the European context, the incidence of malignant tumors of the colon and rectum in young Europeans aged 20 to 39 is increasing by 6 percent per year — with the increase in colon cancer even reaching 7.4 percent per year between 2008 and 2016.

In the Czech Republic, approximately 7,000 new cases of colorectal cancer are diagnosed each year, and more than 3,000 patients die from the disease annually. From an international perspective, the Czech Republic is among the countries with an above-average burden — men occupy 14th place in the European ranking, women 19th place.

Czech Republic Lowers Screening Age — First in Europe

The Czech Republic is responding to the alarming data with a concrete step: from January 1, 2026, the age limit for entering the national screening program has been lowered from 50 to 45 years. This is the first such change in Europe. The new age range for screening is 45 to 74 years, and approximately 16,000 additional examinations per year will be added in the previously uncovered age group of 45 to 49 years.

The reason for this is also a worrying statistic: three out of four cases of colorectal cancer in people under 50 in the USA are diagnosed at an advanced stage, when treatment options are significantly more limited. Early detection dramatically improves the prognosis — five-year survival for a localized finding exceeds 90 percent.

Symptoms That Cannot Be Ignored

Doctors are appealing to young adults not to underestimate warning signs: blood in the stool, a change in the frequency or consistency of bowel movements, unexplained weight loss, persistent abdominal pain, or a feeling of incomplete emptying. These symptoms are too often attributed to hemorrhoids or other benign conditions, leading to delayed diagnosis.

Experts agree: the key to reversing this trend is awareness, lifestyle changes, and regular preventive examinations — sooner than most forty-somethings have realized.