A stomach ulcer is usually caused by either a specific bacteria or long-term irritation of the stomach lining.

Quick Scoop: What Actually Causes Stomach Ulcers?

1. Main medical causes

  • Helicobacter pylori (H. pylori) infection
    This spiral-shaped bacteria lives in the stomachā€™s mucus layer and weakens the protective lining so acid can damage the tissue, forming an ulcer.

Many people carry H. pylori without symptoms, but in some it triggers chronic inflammation (gastritis), indigestion, and ulcers.

  • Regular use of NSAID painkillers
    Medicines like ibuprofen, naproxen, and aspirin reduce protective prostaglandins in the stomach, thinning the mucus barrier and making acid more damaging.

Long-term or high-dose use, especially in older adults, greatly raises ulcer risk.

  • Too much stomach acid (rare conditions)
    Disorders like Zollingerā€“Ellison syndrome cause overproduction of acid, leading to multiple or severe ulcers, but this accounts for less than 1% of cases.
  • Other, less common medical triggers
    • Severe illness, surgery, or being in intensive care (stress ulcers).
* Certain infections (like CMV), chemotherapy, or radiation to the stomach area.

* Stomach cancers or infiltrative diseases that appear as an ulcer on tests.

2. Things that raise your risk (but donā€™t usually cause ulcers alone)

These factors donā€™t usually create an ulcer on their own but make damage more likely if H. pylori or NSAIDs are already present:

  • Smoking ā€“ impairs blood flow and healing in the stomach lining.
  • Heavy alcohol use ā€“ irritates and directly injures the mucosa, worsening acid damage.
  • Older age ā€“ natural thinning of the lining and more frequent medicine use.
  • High physical stress on the body ā€“ such as major trauma, burns, or being on a ventilator.

3. What does not usually cause stomach ulcers (despite the myths)

  • Everyday stress alone (like work stress) is not considered a main cause, though severe physical stress in hospital can lead to ulcers.
  • Spicy or acidic foods do not directly cause ulcers, but they can worsen pain if an ulcer is already there.
  • ā€œBad dietā€ in general is not a primary cause; the key culprits are H. pylori and NSAIDs.

In short: ulcers develop when the stomachā€™s protective lining is weakened and acid gets direct access to the tissue underneath.

4. When to worry and see a doctor

You should seek medical helpā€”urgently if severeā€”if you notice:

  • Burning or gnawing pain in the upper abdomen, especially between meals or at night.
  • Unexplained weight loss, poor appetite, or persistent nausea.
  • Black, tarry stools, vomiting blood, or sudden sharp abdominal pain (these are emergency signs of bleeding or perforation and need immediate care).

Doctors can test for H. pylori and usually treat ulcers with acid-suppressing drugs plus antibiotics if infection is present, and by adjusting painkillers when possible.

5. Mini FAQ angle (like a forum thread)

ā€œIā€™m stressed and love spicy foodā€”did I give myself an ulcer?ā€

Likely not by themselves. The most common story in modern medicine is: H. pylori infection or regular NSAID use, with lifestyle factors like smoking or alcohol making it worse.

TL;DR:
Most stomach ulcers come from H. pylori infection or regular NSAID painkillers, with smoking, alcohol, age, and serious illness increasing the riskā€”but everyday stress and spicy food are mostly bystanders, not main causes.

Information gathered from public forums or data available on the internet and portrayed here.