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Here is a comprehensive table on diarrhea with 15 columns, followed by the image.

Diarrhea: 15-Column Clinical Reference Table

#	Category	Definition	Onset	Duration	Mechanism	Common Pathogens / Causes	Key Symptoms	Stool Characteristics	Diagnosis	First-Line Treatment	Antibiotic Use	Rehydration Approach	Prevention	Complications
1	Acute Watery	≥3 loose stools/day	Sudden	< 14 days	Secretory / osmotic	Norovirus, rotavirus, ETEC, Vibrio cholerae	Nausea, vomiting, cramps	Watery, high-volume, no blood	Clinical; stool culture if severe	Oral rehydration; loperamide for mild-moderate	Not recommended for viral; azithromycin for traveler's diarrhea	Balanced electrolyte solution (ORS) in elderly/cholera; fluids + saltines otherwise	Hand hygiene; avoid high-risk foods while traveling	Dehydration, electrolyte imbalance
2	Dysentery	Bloody diarrhea with mucus	Sudden	< 14 days	Invasive / inflammatory	Shigella, Salmonella, Campylobacter, EIEC, Entamoeba histolytica	Fever, tenesmus, bloody stool	Small-volume, bloody, mucoid	Stool culture; PCR if available	Antibiotics (azithromycin, fluoroquinolone)	Indicated — directed by culture/sensitivity	ORS; IV fluids if severe	Food/water safety; cook meats thoroughly	Sepsis, HUS, toxic megacolon
3	Traveler's Diarrhea (TD)	Diarrhea acquired abroad	Within 1–2 wks of travel	3–5 days	Usually bacterial secretory	ETEC (most common), Campylobacter, Shigella, norovirus	Abrupt loose stools, cramps, low-grade fever	Watery, sometimes bloody	Clinical; culture if persistent	Bismuth subsalicylate; loperamide + antibiotic if moderate-severe	Azithromycin or rifaximin; chemoprophylaxis in high-risk groups	ORS; sports drinks	Pre-travel counseling; avoid uncooked food/tap water	Post-infectious IBS
4	Persistent Diarrhea	Diarrhea lasting 14–30 days	Variable	14–30 days	Mixed or parasitic	Giardia lamblia, Cryptosporidium, Cyclospora	Bloating, fatigue, weight loss	Fatty/loose, foul-smelling	Stool O&P; antigen EIA; PCR	Metronidazole (Giardia); nitazoxanide (Crypto)	Targeted antiparasitic	Continued ORS; nutritional support	Safe water (boiling, filtration)	Malabsorption, nutritional deficiency
5	Chronic Diarrhea	Diarrhea > 30 days	Insidious	> 30 days	IBD, malabsorption, functional	Crohn's, UC, celiac disease, IBS, microscopic colitis	Weight loss, nocturnal stools, blood/mucus	Variable — watery to fatty	Colonoscopy, biopsy, serologies, breath tests	Treat underlying cause (5-ASA, steroids, gluten-free diet)	Rarely indicated	Per underlying disease	Management of underlying condition	Anemia, malnutrition, colon cancer risk (IBD)
6	Secretory Diarrhea	Large-volume watery diarrhea	Variable	Variable	Active ion secretion (e.g., CFTR activation by cholera toxin)	Cholera toxin, VIPoma, carcinoid	Profuse watery stool, minimal pain	Large-volume, watery, "rice-water" in cholera	Clinical + stool osmotic gap (< 50 mOsm/kg)	Aggressive ORS/IV fluids; treat cause	Doxycycline for cholera	IV fluids (Ringer's lactate) for severe cholera	Cholera vaccine; safe water	Severe dehydration, death if untreated
7	Osmotic Diarrhea	Stool driven by unabsorbed solutes	Rapid after ingestion	Stops with fasting	Osmotic pull of water into lumen	Lactase deficiency, sorbitol, lactulose, Mg antacids	Bloating, flatulence	Watery; high osmotic gap (> 125 mOsm/kg)	Dietary history; hydrogen breath test	Eliminate offending agent	Not indicated	ORS if dehydrated	Dietary modification	Usually self-limited; nutritional gaps if prolonged
8	Antibiotic-Associated Diarrhea	Diarrhea during/after antibiotic course	During or up to 8 wks post-antibiotics	Days to weeks	Microbiome disruption; C. difficile toxin	Clostridioides difficile (severe), Clostridium perfringens	Watery diarrhea; fever; abdominal pain; pseudomembranous colitis in C. diff	Watery; may be bloody in C. diff	Stool GDH + toxin EIA; PCR for C. diff	Discontinue offending antibiotic; metronidazole or vancomycin for C. diff	Vancomycin or fidaxomicin for C. difficile	ORS	Judicious antibiotic use; probiotics if post-antibiotic	Pseudomembranous colitis, toxic megacolon, recurrence
9	Inflammatory Diarrhea	Diarrhea with mucosal damage	Variable	Variable	Mucosal invasion / cytokine release	IBD flare, radiation enteritis, ischemic colitis	Bloody stool, fever, severe cramps	Bloody, mucoid, small-volume	Endoscopy + biopsy; fecal calprotectin	Corticosteroids, biologics (IBD); supportive	Not usually indicated	IV fluids in severe cases	IBD management adherence	Perforation, stricture, toxic megacolon
10	Malabsorptive Diarrhea	Failure to absorb nutrients	Insidious	Chronic	Mucosal damage or enzyme deficiency	Celiac disease, short bowel syndrome, pancreatic insufficiency	Steatorrhea, weight loss, bloating	Fatty, pale, foul-smelling, floats	Fecal fat; D-xylose test; celiac serology; imaging	Dietary restriction (gluten-free); pancreatic enzymes	Not indicated	Nutritional support; fat-soluble vitamin replacement	Treat underlying disease	Malnutrition, osteoporosis, anemia
11	Functional Diarrhea / IBS-D	Chronic diarrhea without structural cause	Variable	Chronic, intermittent	Altered gut motility + visceral hypersensitivity	Stress, prior infection (post-infectious IBS), diet	Urgency, cramping, relieved by defecation	Loose to watery, no blood	Rome IV criteria; diagnosis of exclusion	Low-FODMAP diet; loperamide; antispasmodics	Not indicated	Not typically needed	Stress reduction; dietary management	Impaired quality of life; anxiety
12	Neonatal / Pediatric Diarrhea	Diarrhea in infants and children	Acute or chronic	Variable	Viral (most common); osmotic in formula intolerance	Rotavirus, norovirus, adenovirus; cow's milk protein allergy	Vomiting, irritability, fever, dehydration signs	Watery, yellow-green	Clinical; rotavirus antigen test	ORS (Pedialyte); continue breastfeeding	Avoid antibiotics for viral; azithromycin for Campylobacter	Low-osmolarity ORS	Rotavirus vaccine; breastfeeding; hand hygiene	Severe dehydration, death in low-income settings
13	Immunocompromised Diarrhea	Diarrhea in HIV/transplant/chemo patients	Variable	Prolonged	Opportunistic infections; GvHD; drug side effects	CMV colitis, Cryptosporidium, MAC, Microsporidium	Chronic profuse diarrhea, weight loss, fever	Watery, large-volume	Endoscopy + biopsy; stool PCR panel	Treat specific pathogen; ART optimization in HIV	Pathogen-directed (ganciclovir for CMV, etc.)	Aggressive hydration; nutritional support	ART adherence; prophylaxis	Wasting syndrome, sepsis, death
14	Drug-Induced Diarrhea	Diarrhea caused by medication	Shortly after drug initiation	Resolves with discontinuation	Direct mucosal irritation; motility changes; osmotic	Metformin, antibiotics, NSAIDs, colchicine, chemotherapy, laxatives	Loose stools, cramps; no fever	Variable	Medication review; temporal correlation	Discontinue or reduce offending drug; switch formulation	Not indicated	ORS if dehydrated	Medication counseling; dose titration	Usually self-limited; dehydration if severe
15	Food Poisoning / Toxin-Mediated	Rapid-onset diarrhea after ingestion of contaminated food	Within hours (1–6 hrs for toxin; 8–16 hrs for spore-forming)	24–48 hrs	Pre-formed toxin ingestion	Staphylococcus aureus, Bacillus cereus, Clostridium perfringens	Sudden nausea, vomiting, profuse diarrhea	Watery, non-bloody	Clinical; food history; stool culture in outbreaks	Supportive — fluids and rest	Not indicated (toxin, not live infection)	ORS; IV fluids if unable to tolerate oral	Safe food handling, refrigeration, cooking temperatures	Dehydration; electrolyte disturbances

Image: Pathophysiology of Secretory Diarrhea (Mouse Ileal Loop Model)

Secretory diarrhea pathophysiology — cholera toxin model

Figure: Experimental mouse ileal loop model illustrating secretory diarrhea. Panel A shows bowel distension caused by cholera toxin versus saline control. Treatment with CFTR inhibitor (CFTRinh-172) or green tea polyphenols (EGCG, ECG) visibly reduces fluid accumulation. Panel B quantifies bowel weight-to-length ratios — cholera toxin alone produces the highest ratio (~0.35 g/cm), while CFTR inhibition and polyphenol treatment significantly reduce this (p < 0.001), demonstrating the central role of CFTR chloride channels in secretory diarrhea. (Source: PMC Clinical VQA)

Sources: "Diagnosis, Treatment, and Prevention of Acute Diarrheal Infections in Adults" (p. 3); Harrison's Principles of Internal Medicine; PMC Clinical VQA dataset.

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