What Causes Gas? Common & Serious Causes Explained
Gas can be caused by Irritable Bowel Syndrome (IBS), SIBO (Small Intestinal Bacterial Overgrowth), Lactose Intolerance and other conditions. Learn which causes are serious, which are benign, and when to seek urgent medical evaluation.
Updated March 27, 2026
Gas has multiple causes, ranging from benign to serious. The most common include Irritable Bowel Syndrome (IBS), SIBO (Small Intestinal Bacterial Overgrowth), Lactose Intolerance. IBS is a functional gastrointestinal disorder causing recurrent abdominal pain related to defecation, with altered stool frequency or consistency. It affects up to 15% of the population; dietary changes, stress management, and symptom-specific medications help.
Clinical Context
The causes of gas range from benign to serious. Identifying the underlying cause requires clinical evaluation. Common causes include Irritable Bowel Syndrome (IBS), SIBO (Small Intestinal Bacterial Overgrowth), Lactose Intolerance.
Clinical Pathway
Gas — Symptom HubSymptomIrritable Bowel Syndrome (IBS) — Full Condition GuidePrimary CauseIrritable Bowel Syndrome (IBS) — Differential DiagnosisDifferentialDiverticulitis vs. Irritable Bowel Syndrome (IBS) — Comparisonvs.SIBO (Small Intestinal Bacterial Overgrowth) — Full Condition GuideCauseLactose Intolerance — Full Condition GuideCauseFrequently Asked Questions
Why do I have gas? common & serious causes explained?+
Gas has multiple causes, ranging from benign to serious. The most common include Irritable Bowel Syndrome (IBS), SIBO (Small Intestinal Bacterial Overgrowth), Lactose Intolerance. IBS is a functional gastrointestinal disorder causing recurrent abdominal pain related to defecation, with altered stool frequency or consistency. It affects up to 15% of the population; dietary changes, stress management, and symptom-specific medications help.
What is the most common cause of gas?+
Common causes include Irritable Bowel Syndrome (IBS), SIBO (Small Intestinal Bacterial Overgrowth), Lactose Intolerance. The most likely cause depends on age, associated symptoms, and medical history.
When is gas dangerous?+
Seek medical attention if gas is persistent, worsening, sudden in onset, or accompanied by other concerning symptoms.
Can gas be caused by stress or anxiety?+
Yes — psychological stress can contribute to many physical symptoms, but organic causes should be excluded by a healthcare provider.
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