📘 Why does your stomach growl?

What you’ll learn

1. A sound in the quietIdentify borborygmi as sounds from moving digestive contents and distinguish them from hunger itself.A stomach growl may come from the stomach or intestine and records movement, not a precise need for food.
2. A moving tube makes noiseExplain how smooth-muscle contractions, peristalsis, gas, and liquid combine to produce bowel sounds.Coordinated squeezing shifts bubbles and fluid through a flexible tube, creating audible vibrations.
3. The gut's between-meal sweepDescribe the migrating motor complex and its neural, muscular, and hormonal coordination during fasting.Between meals, a recurring motor program sweeps residual contents through the upper gut.
4. Why hunger gets the creditRelate the strongest MMC phase to hunger while explaining why eating and hunger do not map perfectly onto noise.Strong fasting contractions can coincide with hunger, but meals can be noisy and hunger can be silent.
5. What the noise can tell youInterpret ordinary bowel sounds in context and recognize symptom combinations that deserve medical attention.Most noise is normal; associated symptoms and major changes matter more than loudness alone.

Questions this course answers

Grounded in trusted sources

• National Institute of Diabetes and Digestive and Kidney Diseases, Your Digestive System & How It Works, https://www.niddk.nih.gov/health-information/digestive-diseases/digestive-system-how-it-works
• Sanger, G. J., Hellström, P. M., and Näslund, E., The Hungry Stomach: Physiology, Disease, and Drug Development Opportunities, Frontiers in Pharmacology 1:145 (2010), https://doi.org/10.3389/fphar.2010.00145
• Deloose, E. et al., The migrating motor complex: control mechanisms and its role in health and disease, Nature Reviews Gastroenterology & Hepatology 9, 271–285 (2012), https://pubmed.ncbi.nlm.nih.gov/22450306/
• Al-Missri, M. Z. and Jialal, I., Physiology, Motilin, StatPearls, NCBI Bookshelf, https://www.ncbi.nlm.nih.gov/books/NBK545309/
• Shmerling, R. H., Stomach growling and other digestive noise, Harvard Health Publishing, https://www.health.harvard.edu/digestive-health/stomach-growling-and-other-digestive-noise
• International Foundation for Gastrointestinal Disorders, A Noisy Tummy: What Does It Mean?, https://iffgd.org/wp-content/uploads/234-A-Noisy-Tummy-What-Does-it-Mean.pdf
• Wikimedia Commons MediaWiki API, image metadata and 960-pixel thumbnails, https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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