Common Causes of Non-Bloody, Chronic Diarrhea: Adequate Weight Gain
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Diagnosis
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Clinical Features
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Laboratory/Imaging Testing
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Initial Management
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Chronic nonspecific diarrhea (CNSD)
"Toddler's diarrhea"
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- Loose or watery stools, may contain undigested food or mucus
- Occurs in the first few years of life, associated with a diet high in sugar and fluids (i.e., fruit juices) and low in fat/fiber
- Normal growth
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- Diagnosed clinically; labs and imaging are generally not needed
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- Improves with dietary modifications
- Avoid fruit juices, sorbitol/sucrose-sweetened drinks, sports drinks, and sodas
- Avoid artificial sweeteners
- Increase dietary fat and fiber
- Encourage water intake
- Provide reassurance
- Typically resolves by age 5
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Infectious colitis
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- +/- fever, abdominal pain
- Exposure to undercooked meat/fish, unpasteurized dairy products or fruit juices, contaminated water and/or travel
- Childcare center attendance
- Possible presence of blood and/or mucus in stool- refer to Causes of Bloody, Chronic Diarrhea
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- Supportive care in most cases
- If immunocompromised or severe refractory diarrhea, may consider alternative treatment and/or Infectious Diseases consult
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Lactose malabsorption
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- Abdominal discomfort, bloating, flatulence
- Nonbloody diarrhea associated with dairy intake
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- Diagnosed clinically; labs and imaging are generally not needed
- Could consider a hydrogen breath test with lactose substrate-elevated concentration (>20 ppm)
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- Lactose-free diet or lactase supplement with first bite of dairy
- Ensure adequate intake of calcium and vitamin D
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Small bowel bacterial overgrowth
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- Abdominal discomfort and bloating
- Associated with GI tract surgery (i.e., short bowel syndrome, ileocecal valve removal), GI dysmotility
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- Diagnosed clinically; labs and imaging are generally not needed
- Could consider a hydrogen breath test with glucose or lactulose substrate- elevated concentration (>20 ppm)
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- Consider treatment with metronidazole or rifaximin for 14 days
- Can consider GI consult prior to initiation of treatment or if not responsive to initial treatment
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Irritable bowel syndrome (IBS)
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- Constipation, diarrhea, or mixed pattern with feeling of incomplete evacuation
- Abdominal pain relieved by defecation
- May be associated with psychological conditions such as anxiety
- No alarming symptoms such as bloody stools, fever, weight loss
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- Diagnosed clinically; labs and imaging are generally not needed
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- Management focuses on mind-gut connection; biofeedback or meditation may be helpful
- Consider a food diary to determine trigger foods
- For symptomatic relief: could consider supplements such as peppermint oil or ginger, bowel regimen for IBS-C (constipation-predominant), or dicyclomine or other antispasmodic for IBS-D (diarrhea-predominant)
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Post-infectious diarrhea
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- Associated with a recent illness within the past 2-4 weeks, often with diarrhea and vomiting
- May be related to transient lactase deficiency
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- Diagnosed clinically; labs and imaging are generally not needed
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- Supportive care including adequate hydration
- Consider a lactose-free diet or lactase supplement until symptoms improve
- Resolves over time; provide reassurance
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References:
1. Zella GC, Israel EJ. Chronic diarrhea in children. Pediatr Rev. 2012;33(5):207-218.
2. Martin MG, Thiagarajah JR. Approach to chronic diarrhea in children >6 months in resource-abundant settings. In: Connor RF, ed. UpToDate. Wolters Kluwer. Accessed May 2026.
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