# Diagnosis of Constipation, Diarrhea & Pill-Induced Esophagitis
> Learn to identify GI alarm features, classify chronic diarrhea types, and manage pill-induced esophagitis with this comprehensive medical guide.

Tags: gastroenterology, constipation-diagnosis, chronic-diarrhea, pill-induced-esophagitis, colorectal-cancer-screening, mksap, internal-medicine
## Slide 1-2: Clinical Vignette - Constipation Evaluation
* Case: 36F with worsening constipation, rectal bleeding, weight loss, and microcytic anemia (Hgb 10 g/dL).
* **Correct Action:** Colonoscopy. 
* **Rationale:** Alarm features (bleeding, anemia, weight loss) necessitate a full colonic evaluation rather than functional testing.

## Slide 3-5: Diagnostic Approach to Constipation
* **Alarm Features:** Hematochezia, unintentional weight loss, anemia, age >45, or family history of CRC.
* **History & Exam:** Focus on secondary causes (medications) and digital rectal exams with Valsalva maneuver.
* **Testing:** Colonoscopy for structural issues; physiologic testing (manometry, transit tests) for refractory functional cases.

## Slide 6-8: Classification of Diarrhea
* **By Duration:** Acute (<2 weeks), Persistent (2-4 weeks), Chronic (≥4 weeks).
* **Chronic Mechanisms:** 
    * Osmotic (stops with fasting): laxatives, lactose.
    * Secretory (continues with fasting): medications, bile salts.
    * Steatorrhea: malabsorption (celiac, pancreatic dysfunction).
    * Inflammatory: IBD, malignancy.

## Slide 9: Stool Testing and Fecal Osmotic Gap
* **Formula:** 290 − 2 % (stool Naⁱ + stool Kⁱ).
* **Interpretation:** Gap < 50 suggests secretory; Gap > 100 suggests osmotic.
* **Inflammatory Markers:** Fecal calprotectin, stool fat (72-hour), and fecal elastase.

## Slide 10-12: Pill-Induced Esophagitis
* Case: 68F with chest pain and odynophagia after taking alendronate at bedtime.
* **Management:** Discontinue offending medication and modify administration (upright for 30 mins, drink plenty of water).
* **Common Culprits:** Tetracyclines, Bisphosphonates, NSAIDs, Potassium chloride, and Iron (ferrous sulfate).
* **Endoscopy Indications:** Severe, persistent, or atypical symptoms like hematemesis.
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