Also called: Belch · Burp · Eructation · Flatulence · Flatus
Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
About Gas
Everyone has gas. Most people pass gas 13 to 21 times a day. Passing gas through the mouth is called belching or burping. Passing gas through the anus is called flatulence. Most of the time gas does not have an odor. The odor comes from bacteria in the large intestine that release small amounts of gases that contain sulfur.
Gas in the digestive tract comes from two sources: air that you swallow and the breakdown of undigested food by bacteria in the large intestine. Certain foods may cause gas. Foods that produce gas in one person may not cause gas in another.
You can reduce the amount of gas you have by:
- Drinking lots of water and non-fizzy drinks
- Eating more slowly so you swallow less air when you eat
- Avoiding milk products if you have lactose intolerance
Medicines can help reduce gas or the pain and bloating caused by gas. If your symptoms still bother you, see your health care provider.
It sits within Digestive System and Symptoms.
The lead U.S. institute for this subject is the National Institute of Diabetes and Digestive and Kidney Diseases.
When to speak to someone. Reading about a topic cannot tell you whether it applies to you. Speak to a doctor or pharmacist if symptoms are severe, sudden, getting worse, or simply not going away — and seek emergency care immediately for chest pain, breathing difficulty, sudden weakness or confusion, or a serious allergic reaction.
Research on Gas
815 studies areregistered for this condition on ClinicalTrials.gov, the U.S. National Library of Medicine's public registry. A selection is below — the links go straight to the registry entry, not to a summary of ours.
What a registered study does and does not mean. Registration means a study exists and has been declared publicly. It says nothing about whether the treatment being tested works, is safe, or is available to you. Many studies find no benefit — that is what research is for. Never seek out an experimental treatment on the strength of a registry entry alone.
Research currently under way
- Acapella vs Flutter Devices for Improving Breathing and Lung Function After LobectomyRiphah International University
- Clinical Effects of Intraoperative Heat and Moisture Exchange Systems During Thoracic Surgery: A Prospective Observational Cohort StudyMarmara University
- Observational Data Collection for Blood Hemoglobin Algorithm Validation in PediatricsBoston Children's Hospital
- NEPC Study: An Exploratory Safety and Efficacy Study With PSMA, SSTR2 and GRPR Targeted Radioligand Therapy in Metastatic Neuroendocrine Prostate Cancer.Novartis Pharmaceuticals
- A Phase I/II, Dose Finding and Optimization Study of [177Lu]Lu-NeoB in Combination With Capecitabine in Patients With GRPR+, ER+, HER2- Metastatic Breast Cancer After Progression on Previous Endocrine Therapy in Combination With a CDK4/6 Inhibitor.Novartis Pharmaceuticals
- Prenatal Tobacco Exposure and Newborn Outcomes: A Maternal Urinary Cotinine StudyHaseki Training and Research Hospital
Research already completed
- [177Lu]-NeoB in Patients With Advanced Solid Tumors and With [68Ga]-neoB Lesion UptakeAdvanced Accelerator Applications
- Comparison of Ventilatory Effects of Ultrasound-Guided Versus Bronchoscopy-Guided Percutaneous Dilatational TracheostomyProf. Dr. Cemil Tascıoglu Education and Research Hospital Organization
- Excess Base Comparison Between Pregnant Subjects With Severe Preeclampsia vs. Normotensive Pregnant WomenSaint Thomas Hospital, Panama
- Ionized Calcium Changes for Predicting Postoperative Hypocalcemia After Total ThyroidectomyEmrecan Deniz
- Evaluation of Efficacy of Cryotherapy for Skin Anesthesia During Arterial PunctureVersailles Hospital
Study data from ClinicalTrials.gov, a service of the U.S. National Library of Medicine. Retrieved 2026-07-30. Registry entries are supplied by study sponsors and investigators; ClinicalTrials.gov does not verify their scientific validity. PocketsInfo is not affiliated with, and not endorsed by, the NLM or the NIH.
Where to read more
Rather than paraphrase, we point you to the primary sources. Every link below is to a government health agency, a national institute or a recognised medical body — grouped by what you are trying to find out.
Start Here
- Belching, Bloating and FlatulenceAmerican College of Gastroenterology
- Gas in the Digestive TractNational Institute of Diabetes and Digestive and Kidney Diseases
Treatments and Therapies
- Treatment of GasInternational Foundation for Gastrointestinal Disorders
Living With
- Foods Likely to Cause GasInternational Foundation for Gastrointestinal Disorders
Clinical Trials
- ClinicalTrials.gov: FlatulenceNational Institutes of Health
Medical subject headings
Clinicians and researchers index this subject under Eructation, Flatulence. These are the terms to use when searching medical literature.
This page is built from the MedlinePlus health topic record for Gas, a service of the U.S. National Library of Medicine (NLM), National Institutes of Health. Information is from MedlinePlus.gov. PocketsInfo is not affiliated with, and is not endorsed by, the NLM or the NIH. Retrieved 30 July 2026.