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Chronic Diarrhea — Finding the Cause Behind the Urgency
Chronic diarrhea isn't just inconvenient — it is disruptive, exhausting, and often a signal that something specific is going wrong in the digestive tract. Dr. Karmina Choi provides a systematic, specialist evaluation to identify the underlying cause and build a targeted treatment plan, rather than simply managing symptoms indefinitely.
DIGESTIVE & GI CONDITION
Up to 5%
of adults have chronic diarrhea at any given time — most are undertreated
Many
patients go years without accurate diagnosis — a specialist changes that
4 types
each with distinct causes and treatment approaches
What is chronic diarrhea?
Chronic diarrhea is defined as loose or watery stools lasting longer than four weeks. But the number of bowel movements is only part of the picture — patients describe chronic diarrhea as loose stool consistency, urgent and unpredictable bowel movements, inability to hold stool, or simply never feeling like the bowel is fully settled.
Unlike acute diarrhea — which is usually a self-limiting infection — chronic diarrhea has a broad and specific differential diagnosis that spans functional disorders, structural disease, dietary intolerances, microbiome disruption, gastric causes, medication effects, and inflammatory conditions. Identifying which category applies to you is the essential first step — because the right treatment for one type may be completely ineffective for another.
Left undiagnosed, chronic diarrhea causes progressive dehydration, nutritional deficiencies, social isolation, anxiety, and — in some cases — fecal incontinence. It deserves proper specialist evaluation, not indefinite symptom management with over-the-counter antidiarrheals.
Types of chronic diarrhea — the mechanism determines the treatment
Watery diarrhea
Large-volume, watery stools that persist even when fasting (secretory) or resolve with fasting (osmotic). Causes include bile acid malabsorption, microscopic colitis, SIBO, carbohydrate intolerances, and certain medications. Often misdiagnosed as IBS.
Fatty diarrhea (steatorrhea)
Greasy, foul-smelling, pale stools that float. Indicates fat malabsorption from celiac disease, exocrine pancreatic insufficiency, SIBO, low stomach acid impairing protein and fat digestion, or small bowel disorders. Often accompanied by weight loss and nutritional deficiencies.
Inflammatory diarrhea
Bloody or mucus-laden diarrhea with cramping, fever, or urgency. Caused by inflammatory bowel disease, infectious colitis, microscopic colitis, radiation colitis, or colorectal cancer. Always requires investigation.
Functional diarrhea / IBS-D
Loose stools with or without pain, often triggered by stress, certain foods, or meals. Normal structural investigations. Caused by gut-brain axis dysfunction, visceral hypersensitivity, or microbiome imbalance. The most common subtype — but only diagnosed after other causes are excluded.
Symptoms and patterns that guide diagnosis
Urgency and unpredictability
Sudden, intense need to reach a bathroom with little warning — often forcing patients to plan their lives around restroom access.
Loose or watery stools
Stools that are consistently unformed, soft, or liquid — persisting for more than four weeks regardless of diet changes.
High frequency
More than three bowel movements per day — significantly disrupting work, social activities, and sleep.
Abdominal cramping
Pain or pressure that builds before bowel movements and may partially resolve after — common in both IBS-D and inflammatory causes.
Bloating and gas
Significant abdominal distension — particularly prominent in SIBO, carbohydrate intolerance, and bile acid malabsorption.
Fecal urgency or incontinence
Difficulty holding stool to reach the bathroom in time — significantly impacts quality of life, yet rarely volunteered to doctors.
Food-triggered symptoms
Diarrhea that reliably follows certain foods — dairy, gluten, high-fat meals, caffeine — suggests a dietary or absorptive cause.
Weight loss or nutritional deficiency
Unintended weight loss, fatigue, or low B12, iron, or vitamin D — signs of malabsorption that always warrant investigation.
Red flag symptoms — seek prompt evaluation
Chronic diarrhea alongside any of the following warrants urgent specialist evaluation to rule out IBD, colorectal cancer, and other serious conditions.
Blood or mucus in stool
Unintended weight loss
New onset diarrhea after age 50
Iron deficiency anemia without explanation
Diarrhea that wakes you from sleep
Abdominal mass or significant pain
Fever accompanying diarrhea
Family history of IBD or colorectal cancer
Common causes — organized by mechanism
IBS-D
Diarrhea-predominant IBS — functional, stress-sensitive, pain-associated. The most frequently diagnosed cause of chronic diarrhea.
Functional, gut-brain, and microbiome causes — the most common category Dr. Choi sees
SIBO
Bacterial overgrowth in the small intestine causing bloating, gas, and loose stools — frequently coexisting with functional diarrhea.
Functional diarrhea
Chronic loose stools without pain, not meeting full IBS criteria — drivenn by motility dysregulation, diet, and gut-brain axis disruption.
Structural and inflammatory causes — important to exclude
Ulcerative colitis
Chronic colonic inflammation with bloody diarrhea, urgency and cramping.
Crohn's disease
Transmural GI inflammation — diarrhea with pain and weight loss.
Microscopic colitis
Biopsy-confirmed colonic inflammation in a visually normal colonoscopy. Less common but worth excluding in appropriate patients.
Colorectal polyps / cancer
Large polyps or rectal tumors can cause diarrhea, bleeding and mucus — requires colonoscopy.
Medication and systemic causes
Proctitis
Rectal inflammatory causing urgency, frequent small bowel movements, and mucus.
Radiation proctocolitis
Chronic diarrhea following pelvic radiation for prostate, gynecological or rectal cancer.
Celiac disease
Gluten-triggered small bowel damage causing fatty diarrhea, weight loss, and nutritional deficiency.
Bile acid malabsoprtion
Excess bile acids reach the colon after cholecystectomy or ileal disease — causing watery, urgent diarrhea. Often misdiagnosed as IBS-D.
Visceral hypersensitivity
Heightened gut nerve sensitivity producing. urgency and diarrhea from normal stimuli — often underlying IBS-D.
Dietary, absorptive and upper GI causes
Lactose / carbohydrate intolerance
Osmotic diarrhea triggered by lactose, fructose, or high-FODMAP foods.
Chronic gastritis / low stomach acid
Impaired gastric acid production — from H. pylori, autoimmune gastritis, or long-term PPI use — disrupts protein and fat digestion, promotes bacterial overgrowth, and can cause persistent loose stools alongside nutritional deficiencies. An underrecognized upper GI contributor. Dr. Choi evaluates routinely.
Thyroid / endocrine disorders
Hyperthyroidism accelerates GI motility — diarrhea with weight loss, palpitations, and heat intolerance.
Medication-induced
Antibiotics, metformin, PPIs, SSRIs, magnesium supplements, and many others can cause chronic diarrhea.
Post-infectious diarrhea
Persistent diarrhea following.a GI infection — triggered by gut flora disruption or post-infectious IBS.
How Dr. Choi evaluates chronic diarrhea?
The evaluation is systematic — designed to categorize the diarrhea type first, then narrow to the specific cause, rather than ordering every test at once.
Comprehensive symptom history. Stool frequency, consistency, color, and odor. Relationship to meals, fasting, stress, specific foods, and time of day. Prior GI infections, surgeries, radiation, or recent antibiotics. Medication review — including PPI use, which is a frequently overlooked contributor.
Blood tests. Complete blood count, C-reactive protein, thyroid function, celiac antibodies (anti-tTG IgA and total IgA), and metabolic panel. A nutritional panel — B12, ferritin, magnesium, and vitamin D — is added when malabsorption is suspected, as deficiencies signal upstream absorptive failure that may include a gastric cause such as chronic gastritis or low stomach acid. H. pylori testing is included when upper GI symptoms, nutritional deficiencies, or a history of acid suppressor use point to a gastric contributor.
Stool studies. Fecal calprotectin (distinguishes inflammatory from functional diarrhea), stool culture, ova and parasites, C. difficile testing, and fecal fat when malabsorption is suspected.
Colonoscopy with biopsies when indicated. For patients with red flag symptoms, blood or mucus in stool, or when structural and inflammatory causes cannot be excluded. Biopsies are taken even when the colonoscopy appears visually normal, as certain diagnoses — including microscopic colitis — are only identifiable on histology. That said, most patients with chronic diarrhea who see Dr. Choi are ultimately found to have functional, gastric, or dietary causes rather than structural colonic disease.
Additional targeted testing when indicated. Empiric bile acid sequestrant trial for bile acid malabsorption. SIBO breath testing. Upper endoscopy with gastric biopsies when chronic gastritis or low acid is suspected. Small bowel imaging for Crohn's disease or malabsorptive disorders. Anorectal manometry when fecal incontinence complicates the picture.
Treatment — matched precisely to the cause
Dietary identification and modification
A structured dietary review identifies food triggers — lactose, gluten, high-FODMAP items, caffeine, and artificial sweeteners. A low-FODMAP elimination and reintroduction protocol resolves or significantly improves symptoms in a large proportion of functional and IBS-D patients. For celiac disease, strict gluten elimination is the primary treatment. For bile acid malabsorption, a low-fat diet reduces symptom severity alongside targeted therapy.
Probiotics, soluble fiber, and natural gut regulators
Targeted probiotic strains restore microbiome balance disrupted by antibiotics, infection, or dysbiosis. Soluble fiber (psyllium) absorbs excess water and firms stool. Peppermint oil reduces gut spasm and urgency. These natural interventions are introduced before pharmaceutical antidiarrheals whenever the clinical situation allows.
Gut-brain axis support
For functional and IBS-D-type diarrhea, stress and anxiety directly accelerate colon transit and lower the threshold for urgency. Mindfulness practices, structured relaxation, regular moderate exercise, and good sleep hygiene reduce the autonomic nervous system hyperactivity that drives functional diarrhea — before considering behavioral referrals or neuromodulators.
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Cause-specific pharmaceutical and targeted treatment
Treatment is matched precisely to the diagnosis. For IBS-D: antispasmodics reduce cramping and urgency; rifaximin addresses dysbiosis and SIBO. For bile acid malabsorption: cholestyramine or colesevelam bind excess bile acids. For IBD: Dr. Choi initiates management and coordinates with gastroenterology. When chronic gastritis or low stomach acid is identified as a contributor — through H. pylori eradication, nutritional repletion, or reassessment of long-term acid suppressor therapy — addressing the upstream gastric cause often resolves downstream diarrhea and malabsorption that has been refractory to other approaches. Antidiarrheals such as loperamide provide symptom control while the underlying cause is addressed.
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Neuromodulators for refractory functional diarrhea
For patients with persistent IBS-D or functional diarrhea that has not responded to dietary, natural, and standard pharmaceutical approaches, low-dose neuromodulators can significantly reduce gut nerve hypersensitivity and slow transit. Discussed transparently and reserved for cases where other approaches have been genuinely exhausted.
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Multidisciplinary referral for complex cases
Patients with confirmed IBD, celiac disease, or complex malabsorptive disorders are coordinated to the appropriate specialist — gastroenterology, dietitian, or colorectal surgery when indicated. Dr. Choi remains involved in the anorectal and functional aspects of care throughout.
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There is no single treatment for chronic diarrhea — the right intervention depends entirely on the underlying mechanism. Dr. Choi's approach starts with the most natural and least invasive options and escalates only based on what the diagnosis requires.
Why choose Dr. Karmina Choi?
Systematic diagnosis
Diarrhea is categorized by type before targeted testing begins — functional, structural, dietary, and upper GI causes each evaluated with the right tests.
Broad clinical lens
Dr. Choi looks beyond the colon — recognizing upper GI contributors like chronic gastritis and low stomach acid that frequently drive diarrhea and malabsorption in patients whose structural workup is otherwise normal.
Colonoscopy in one practice
When a colonoscopy is needed, Dr. Choi performs it — no referral elsewhere, continuity of care throughout.
Natural-first philosophy
Dietary changes, probiotics, and nutritional repletion come before pharmaceuticals. Medication is introduced when genuinely needed.
Female physician option
Chronic diarrhea and its consequences are deeply personal. Dr. Choi provides a compassionate, non-judgmental environment.
Common Questions
How long does diarrhea have to last before it's considered chronic?
The clinical definition is loose stools lasting more than four weeks. However, even diarrhea persisting for two to three weeks without an obvious infectious cause — or recurring repeatedly over months — warrants evaluation. If your bowel habits have changed significantly and affect daily life, that is reason enough to see a specialist.
My colonoscopy was normal. Does that mean my diarrhea is just IBS?
Not necessarily. A normal colonoscopy rules out ulcerative colitis, Crohn's, colorectal cancer, and major polyps — which is important — but it does not rule out IBS-D, visceral hypersensitivity, SIBO, bile acid malabsorption, celiac disease, chronic gastritis with low stomach acid, or systemic causes. In fact, most patients Dr. Choi evaluates for chronic diarrhea are found to have functional, dietary, or upper GI causes rather than structural colonic disease. A normal colonoscopy is reassuring, but it is one piece of the diagnostic picture, not the final answer.
What is bile acid malabsorption and could it be causing my diarrhea?
Bile acid malabsorption occurs when bile acids pass into the colon and trigger watery, urgent diarrhea. It is significantly underrecognized — particularly in patients who have had their gallbladder removed or have had ileal disease. It is also found in a subset of patients diagnosed with IBS-D who haven't responded to standard treatment. An empiric trial of a bile acid sequestrant is often both diagnostic and therapeutic.
Is there a risk of fecal incontinence with chronic diarrhea?
Yes — liquid stool is significantly harder to control than formed stool, and chronic urgency can strain the sphincter and pelvic floor over time. Many patients with chronic diarrhea experience urgency incontinence. Dr. Choi evaluates sphincter and pelvic floor function as part of the workup when incontinence is present, as addressing diarrhea alone may not fully resolve it.
Chronic diarrhea is not something you simply have to live with.
The right diagnosis changes everything. Dr. Choi can identify what's driving your symptoms — and build a plan that actually addresses it.
1625 Anderson Avenue, Suite 203, Fort Lee, New Jersey 07024
This page is for informational purposes only and does not constitute medical advice. Individual results vary. Please consult Dr. Choi for a personalized evaluation and treatment plan.
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Colorectal Care of New Jersey
Expert, compassionate colorectal care — from office procedures to complex surgery — with a natural-first approach and a commitment to your long-term quality of life.
1625 Anderson Ave, Ste 203
Fort Lee, New Jersey 07024
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