Peptic ulcers are primarily caused by stress and lifestyle.

Not a fact anymore

Peptic ulcers are primarily caused by stress and lifestyle.

What we know now

Most peptic ulcers are caused by Helicobacter pylori infection or by certain medications, particularly nonsteroidal anti-inflammatory drugs (NSAIDs).

Why it changed

Research by Barry Marshall and Robin Warren established the connection between H. pylori, gastritis, and peptic-ulcer disease, replacing the dominant emphasis on stress and lifestyle with an infectious explanation for most cases.

Status: Superseded
Category: Medicine
Accepted approximately: Mid-20th century to the 1980s
Changed approximately: 1982–1990s

The older claim was not simply a fringe misconception. Stress, diet, smoking, personality, and excess acid were widely emphasized in medical explanations and treatment. The discovery of H. pylori did not make stress irrelevant to symptoms or health, but it fundamentally changed the accepted causal explanation for most peptic ulcers.

This entry is classified as Superseded, rather than merely overturned, because the older model was replaced by a stronger causal account while some contributing lifestyle factors can still affect symptoms, healing, or recurrence.

Evidence

Sources and what they establish

Historical context

The 2005 Nobel Prize in Physiology or Medicine – Press release The Nobel Prize
Explains that stress and lifestyle were considered major causes before Marshall and Warren's discovery of H. pylori.

Current evidence

Peptic Ulcer Disease U.S. National Institute of Diabetes and Digestive and Kidney Diseases
Identifies H. pylori infection and NSAID use as the most common causes of peptic ulcers.

Primary research

Discovery of Helicobacter pylori and its role in gastritis and peptic ulcer disease The Nobel Prize
Provides the scientific background behind the Nobel Prize awarded to Barry Marshall and Robin Warren.