That line is a clickbait-style fragment, and by itself it’s misleading. There is no credible medical consensus that “eating onion causes” a single specific dangerous condition in the way those viral posts usually imply.
What onions actually do (based on real evidence):
Onion are generally healthy, but they can affect people in a few known ways:
1) Gas, bloating, and stomach irritation
Onions contain fermentable fibers (fructans) that can cause:
- Gas
- Bloating
- Abdominal discomfort
This is especially true for people with IBS (irritable bowel syndrome) or sensitive digestion.
2) Acid reflux in some people
Raw onions can relax the lower esophageal sphincter, which may:
- Worsen heartburn
- Trigger reflux symptoms in sensitive individuals
3) Blood sugar and heart health benefits (the part clickbait ignores)
Onions also contain antioxidants like quercetin and compounds that may:
- Support heart health
- Help regulate blood sugar
- Reduce inflammation in some studies
Bottom line
Onions don’t “cause” a dangerous disease in healthy people. At most, they can trigger digestive discomfort in sensitive individuals, especially when eaten raw or in large amounts.
If you saw a specific claim (like “onion causes kidney damage” or “onion is toxic”), paste the full sentence—I can break down whether it’s true or just internet exaggeration.
