A 32-year-old woman presents with severe anal pain during and after defecation for the past 3 weeks. She reports bright red blood on toilet paper and constipation. On examination, a visible tear is seen in the posterior midline of the anal canal. Digital rectal examination is extremely painful and she refuses further assessment. There is no history of trauma, inflammatory bowel disease, or prior anorectal surgery. What is the most appropriate initial management?

Explanation

## Diagnosis: Acute Anal Fissure **Key Point:** Acute anal fissures (< 6 weeks) are managed conservatively in the vast majority of cases. The posterior midline location and severe pain with visible tear are classic. **High-Yield:** Conservative management succeeds in 90% of acute fissures and includes: 1. Stool softeners (docusate, lactulose) to reduce straining 2. High-fiber diet (20–30 g/day) 3. Topical nitrates (0.2% glyceryl trinitrate) — reduces sphincter pressure and promotes healing 4. Sitz baths (15–20 min, 3–4 times daily) — pain relief and improved blood flow 5. Topical anesthetics (lidocaine) for symptomatic relief **Clinical Pearl:** The severe pain and refusal of DRE are typical of acute fissure; this does NOT indicate need for surgery. Pain improves within days of starting topical nitrates, and most fissures heal within 4–6 weeks with conservative care. **Mnemonic: FISSURE FIRST** — **F**iber, **I**rritant avoidance, **S**itz baths, **S**tools (softeners), **U**nderstanding (reassurance), **R**ectal nitrates, **E**xpect healing in weeks. ## Why Surgery Is Not First-Line Surgical options (lateral internal sphincterotomy, botulinum toxin) are reserved for: - Chronic fissures (> 6 weeks) failing conservative therapy - Recurrent fissures after initial healing - Fissures in setting of Crohn's disease or malignancy Surgery carries risk of fecal incontinence (1–5%) and should never be the initial approach in an otherwise healthy patient with an acute fissure.