GI & Digestive Conditions
The gastrointestinal system is where a lot of the confusion starts — and where a lot of the wrong labels get applied. Diarrhea, bloating, cramping, reflux, and swallowing difficulty are symptoms that can come from a dozen different places. The conditions in this section are frequently mistaken for each other, frequently blamed on the wrong upstream cause, and frequently managed with medications that treat the symptom while the actual cause keeps running in the background. Several of them are directly connected to celiac disease and hereditary fructose intolerance — conditions documented elsewhere in this library — and understanding those connections can change the entire diagnostic picture.
Every page in this section follows the same approach: plain language, real sources, honest personal notes, and the specific questions worth asking your physician before accepting a label that may not be the right one.
Crohn's Disease
Crohn's disease is a chronic inflammatory bowel disease that can affect any part of the digestive tract from mouth to anus — though its primary territory is the terminal ileum, the last section of the small intestine. Unlike ulcerative colitis, Crohn's inflammation penetrates through the full thickness of the gut wall and follows a skip pattern — inflamed sections separated by healthy tissue. It causes significant malabsorption, carries risk of serious structural complications, and is frequently misdiagnosed as appendicitis when it presents in the lower right abdomen. Surgery does not cure Crohn's. Understanding what it is — and what it isn't — is the starting point.
Colitis & Ulcerative Colitis
Ulcerative colitis is a chronic inflammatory bowel disease strictly limited to the large intestine and rectum. It starts at the rectum and works upward continuously — no skip pattern, no small intestine involvement. Bloody stool and urgency are its hallmarks. Unlike Crohn's disease, colectomy — surgical removal of the colon — can cure UC in the structural sense. This page also covers colitis as a broader category, including microscopic colitis — a condition that produces significant watery diarrhea with a completely normal-appearing colon on visual inspection. Microscopic colitis is a biopsy-only diagnosis. A clean scope does not rule it out.
IBS / IBS-D
Irritable bowel syndrome is one of the most commonly applied diagnoses in gastroenterology — and one of the most important labels to push back on before accepting it. IBS describes what the gut is doing. It does not explain why. For a significant number of patients, an IBS label is sitting on top of an unidentified upstream cause — celiac disease, hereditary fructose intolerance, SIBO, or endometriosis among the most common. This page is about the difference between a description and a diagnosis, and the questions worth asking before the prescription gets written.
SIBO — Small Intestinal Bacterial Overgrowth
SIBO occurs when bacteria that belong in the large intestine establish themselves in the small intestine — fermenting food ahead of schedule and producing bloating, gas, and diarrhea that looks exactly like IBS on the surface. The symptom timing is the most useful signal: bloating and GI distress appearing within one to three hours of eating points toward the small intestine. This page also contains a critical warning about SIBO breath testing — some breath tests use fructose as the substrate, and for anyone with undiagnosed hereditary fructose intolerance, that test can trigger a serious medical crisis. Ask what is in the solution before you drink anything.
Lactose Intolerance
Lactose intolerance is not always what it appears to be. Primary lactose intolerance is genetic — the lactase enzyme gradually reduces with age in people without the lactase persistence mutation. Secondary lactose intolerance is caused by damage to the small intestinal villi — and celiac disease is one of the most common and most underrecognized causes of that damage. When celiac destroys the villi, lactase production drops with them. Remove the grain, heal the villi, restore the lactase, and the dairy tolerance can return completely. This page covers the full picture — including why the calcium and vitamin D supplements prescribed when dairy is eliminated frequently don't work the way anyone hopes, and what the only real fix actually looks like.
Eosinophilic Esophagitis — EoE
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Whipple's Disease
Whipple's disease is a bacterial infection caused by Tropheryma whipplei — an organism that lives in soil and contaminated water, including floodwater. It is a systemic mimic, producing joint pain, GI symptoms, fatigue, and in serious cases neurological and cardiac involvement that can be mistaken for autoimmune disease for years. It is one of the few conditions in this library that is completely curable with the right antibiotic — but the right antibiotic requires the right diagnosis first, and the average time to diagnosis is measured in years. If you have had significant flood or soil exposure and you are presenting with joint pain plus GI symptoms that won't resolve — this page is worth reading before moving on.
GERD / Acid Reflux
Gastroesophageal reflux disease is the most common GI diagnosis in the developed world — and one of the most commonly overtreated without the underlying cause ever being identified. GERD is a symptom pattern, not a single disease. The cause determines the treatment. A structural cause like a hiatal hernia requires structural management. A medication-induced cause like regular NSAID use requires removing the medication. A dietary and lifestyle cause requires dietary and lifestyle intervention. This page also covers the documented long-term consequences of PPI use that consumer advertising does not lead with — and the significant number of people whose daily ibuprofen, allergy pills, or nighttime pain relievers are driving GI symptoms they have never connected to those products.
Hiatal Hernia
A hiatal hernia occurs when part of the stomach pushes through the diaphragm into the chest cavity. Not all hiatal hernias are the same — a small sliding hernia and a large paraesophageal hernia with significant stomach volume sitting above the diaphragm pressing on the lungs and heart are not the same condition receiving different severity labels. They are mechanically different problems with different risk profiles and different treatment standards. This page exists in large part because of direct family experience with large paraesophageal hernias that were managed with acid reflux pills for years while the structural reality was never adequately addressed — and the serious consequences that followed.