Stories about unusual causes of cancer can spread quickly online, especially when they involve everyday habits that “everyone has” — like washing dishes, using dishwashers, or handling detergents. However, when it comes to serious diseases like stomach cancer, current medical research identifies specific risk factors that are supported by evidence, rather than household chores. It’s important to understand what scientists really know about what increases — and what does not increase — the risk of stomach cancer.
The Real Causes of Stomach Cancer: What Research Shows
Stomach cancer (also called gastric cancer) does not develop from a single common household behavior. Instead, it tends to be linked to well‑recognized biological and lifestyle risks documented by major health organizations:
1. Helicobacter pylori Infection — A Major Known Cause
One of the strongest risk factors for stomach cancer is infection with a bacterium called Helicobacter pylori. This common stomach bacterium can cause chronic inflammation, ulcers, and over many years may contribute to cancer development. In fact, research suggests that around three‑quarters of stomach cancer cases worldwide could be linked to H. pylori infection.
The infection often has no obvious symptoms, which is why many people don’t realize they carry it. It can be transmitted through contaminated food or water, or by close person‑to‑person contact, such as sharing utensils or serving from the same dishes without proper hygiene precautions.
