A stomach ulcer is a sore that develops on the lining of the stomach or the duodenum, which is the first part of the small intestine. The stomach naturally produces a powerful acid to aid digestion and kill bacteria. To protect its own tissue from this acid, the stomach lining is covered by a thick layer of mucus. When this protective layer is broken down or fails to function correctly, the acid can cause damage to the stomach wall, resulting in an ulcer. While many people believe that lifestyle choices like stress or diet are the primary causes, medical research has identified specific biological and pharmacological triggers. In the United Kingdom, healthcare professionals focus on identifying these underlying causes to ensure effective treatment and prevent the recurrence of these painful sores.
What We’ll Discuss in This Article
- The biological role of the stomach mucosal barrier
- How Helicobacter pylori bacteria trigger ulcer formation
- The impact of non-steroidal anti-inflammatory drugs (NSAIDs)
- Why stress and spicy foods are no longer considered primary causes
- Rarer medical conditions that can lead to gastric sores
- How identifying the specific cause guides medical treatment
Stomach ulcers are primarily caused by a bacterial infection or the long-term use of anti-inflammatory medications
The most frequent triggers for stomach ulcers in the UK are the presence of specific bacteria or the side effects of commonly used painkillers. Stomach ulcers are open sores that develop on the lining of the stomach often resulting from an imbalance between digestive acids and the protective mucus layer. When this balance is disrupted, the acid erodes the stomach lining, creating a localised sore. While the body has robust defence mechanisms, certain factors can significantly weaken the gastric environment, making it vulnerable to erosion. Identifying whether an ulcer is driven by infection or medication is the first step in the clinical diagnostic pathway.
Helicobacter pylori (H. pylori) infection
A significant majority of peptic ulcers are caused by an infection with the Helicobacter pylori bacteria. These bacteria are very common and can live in the digestive tract for many years without causing symptoms. However, in some individuals, H. pylori irritates the stomach lining and increases the amount of acid produced. According to the National Institute for Health and Care Excellence, H. pylori infection and the use of NSAIDs are the two main causes of peptic ulcers. Over time, this irritation breaks down the protective mucus barrier, allowing gastric acid to reach the sensitive tissue beneath. Testing for this bacteria is a standard procedure in UK primary care for anyone presenting with persistent ulcer symptoms.
The role of non-steroidal anti-inflammatory drugs (NSAIDs)
The regular use of a class of painkillers known as NSAIDs is the second most common cause of stomach ulcers. These medications include widely used drugs such as ibuprofen, aspirin, and naproxen. While they are effective at reducing pain and inflammation throughout the body, they can also interfere with the production of chemicals that help protect the stomach lining from acid. Regularly taking aspirin or other anti-inflammatory drugs can lead to stomach ulcers by leaving the stomach wall exposed to digestive juices. This risk is particularly high for individuals who take these medications frequently, at high doses, or for extended periods of time.
Misconceptions regarding stress and diet
For many years, it was widely believed that psychological stress and the consumption of spicy foods were the primary causes of stomach ulcers. Modern clinical evidence has disproven this, showing that while these factors can certainly worsen the symptoms of an existing ulcer, they are rarely the initial cause. Heartburn and acid reflux are common symptoms of stomach ulcers, which can be exacerbated by smoking or drinking alcohol. Although lifestyle adjustments are recommended to support healing, they are generally considered supplementary to the medical treatment required to address the actual biological trigger, such as clearing an infection or changing medication.
Rarer causes and medical conditions
In a small number of cases, stomach ulcers may be caused by less common factors or underlying medical conditions. This includes Zollinger-Ellison syndrome, a rare condition where the body produces excessive amounts of the hormone gastrin, leading to extreme acid production and multiple ulcers. Severe physiological stress, such as that experienced during a major surgery, serious injury, or critical illness, can also lead to the rapid development of acute “stress ulcers” in the stomach lining. These cases usually require specialist gastroenterology input and intensive acid-suppression therapy to manage the heightened risk of complications like bleeding or perforation.
Conclusion
The primary causes of stomach ulcers are H. pylori bacterial infections and the frequent use of anti-inflammatory medications. While lifestyle factors like stress and diet can aggravate symptoms, they do not typically cause the initial sore. Identifying the specific trigger through clinical testing is essential for providing the correct treatment, such as a course of antibiotics or acid-suppressing drugs. Most ulcers can be successfully healed once the underlying cause is addressed by a healthcare professional. If you experience severe, sudden, or worsening symptoms, call 999 immediately.
Can I get a stomach ulcer from drinking too much coffee?
Coffee does not cause ulcers, but its acidity and caffeine content can irritate an existing ulcer and make your symptoms feel worse.
Is H. pylori permanent if I don’t treat it?
The infection usually persists for life unless it is cleared with a specific course of antibiotics prescribed by a doctor.
Are stomach ulcers hereditary?
While the ulcers themselves are not directly inherited, some families may have a genetic predisposition to H. pylori infection or higher acid production.
Can children get stomach ulcers?
Yes, though it is much less common than in adults, children can develop ulcers, usually due to H. pylori infection.
How does smoking affect stomach ulcers?
Smoking increases the risk of developing an ulcer and can significantly slow down the healing process by reducing blood flow to the stomach lining.
Does paracetamol cause stomach ulcers?
No, paracetamol is generally considered safe for the stomach and does not cause ulcers, unlike NSAIDs like ibuprofen or aspirin.
Can an ulcer be caused by a virus?
While rare, certain viral infections like cytomegalovirus can cause gastric sores, primarily in individuals with weakened immune systems.
Authority Snapshot (E-E-A-T Block)
This article was developed by the Medical Content Team to provide the general public with accurate information on the causes of stomach ulcers. The content has been reviewed by Dr. Rebecca Fernandez, a UK-trained physician with extensive experience in internal and emergency medicine, to ensure complete alignment with NHS and NICE clinical guidance. Our purpose is to help patients understand the biological triggers of digestive conditions through factual and restrained reporting.
