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Diarrhea Lasting 6 Days: Not Just Food Poisoning—When to See a Doctor

Watery diarrhea persisting for 6 days goes beyond typical food poisoning (usually 24–72 hours). It warrants medical evaluation to identify the cause and prevent complications.

Red Flags Requiring Prompt Care

Blood or mucus in stool
Fever >38.5°C (101.3°F)
Signs of dehydration: dry mouth, reduced urine, dizziness, tachycardia
Severe abdominal pain
Weight loss >3 kg
Immunocompromised state (HIV, chemo, steroids)
Recent antibiotics (risk for C. difficile)
Travel to endemic areas

Differential Diagnosis

Initial Workup

Stool: culture, O&P, C. difficile toxin, calprotectin, occult blood.
Blood: CBC, BMP, Mg, TSH, CRP.
Consider colonoscopy if >50, bleeding, weight loss, or family history of CRC.

Supportive Management While Awaiting Diagnosis

Oral rehydration solution (ORS) or IV fluids if dehydrated.
Loperamide (if no blood/fever) for symptom control.
Bland diet (BRAT not evidence-based; resume normal diet as tolerated).
Probiotics (certain strains may shorten duration).

Do not self-medicate with antibiotics without a confirmed bacterial diagnosis—they can worsen C. difficile or cause resistance. See a clinician for targeted therapy.

Poisoning - Related Articles

Category	Examples
Infectious	C. difficile, parasites (Giardia, Crypto), EHEC, viral (norovirus prolonged), TB
Inflammatory	IBD flare (Crohn's, UC), microscopic colitis
Malabsorption	Celiac, pancreatic insufficiency, bile acid diarrhea
Medication-induced	Antibiotics, metformin, PPIs, laxative abuse
Functional	IBS-D (diagnosis of exclusion)
Endocrine	Hyperthyroidism, Addison's, carcinoid