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Anal fissure in adults

ASCRS-based recognition and staged care of acute and chronic anal fissure, including conservative care, topical therapy, botulinum toxin and surgery.

JurisdictionUnited States
Source check2026-08-20
Clinical reviewiatroX editorial team 路 Clinical editorial review 路 reviewed 2026-08-20 路 due 2027-08-20
AudienceUnited States healthcare professionals
This is an iatroX educational summary of named United States sources, not an official guideline. It does not replace the complete source documents, local policy, specialist advice or clinical judgement. Use the named authority, current FDA labeling, applicable state law, payer rules and local protocol where relevant.

Scope of this summary

Adults with a typical painful linear tear of the anal canal. Acute fissure generally means symptoms for less than six weeks; chronic fissure develops chronicity features and often internal-sphincter hypertonicity. Lateral, multiple or painless lesions and pediatric disease require a different differential and pathway.
sources for this section:ascrs-anal-fissures-2023

The Bottom Line

  • Recognize the typical syndrome of sharp pain during and after defecation with small-volume bright bleeding, but inspect gently and avoid forcing an examination that causes severe pain.
  • Use nonoperative treatment first for acute fissure: correct hard stool or diarrhea, provide fiber and fluids, use sitz baths and select analgesia while avoiding constipating medication where possible.
  • For chronic fissure, topical calcium-channel blockers have similar efficacy and fewer adverse effects than topical nitrates and can be used as first-line chemical sphincter relaxation.
  • Botulinum toxin has similar outcomes to topical therapy as first-line treatment and may modestly improve healing after failed topical care; dose and injection technique are specialist decisions.
  • Lateral internal sphincterotomy is highly effective in appropriately selected chronic fissure, but continence risk requires careful history and a tailored procedure rather than automatic surgery.
sources for this section:ascrs-anal-fissures-2023

Practical clinical workflow

1
Clarify duration, stool consistency, childbirth or anorectal surgery, continence, inflammatory bowel symptoms, infection risk and prior treatment; inspect location and chronicity when tolerable.
2
For a typical acute posterior or anterior fissure, start stool normalization, warm baths and pain control, explain the healing cycle and reassess within a defined interval.
3
When chronic, discuss a compounded topical calcium-channel blocker or nitrate using local formulation, contraindication and headache counseling; ensure the patient understands application and duration.
4
Refer persistent disease for botulinum toxin or operative assessment, documenting baseline continence, obstetric injury, sphincter surgery and other factors that may favor a sphincter-preserving approach.
5
Investigate atypical fissures for Crohn disease, HIV, syphilis, tuberculosis, malignancy or hematologic disease according to the clinical context instead of repeatedly applying topical treatment.
sources for this section:ascrs-anal-fissures-2023

Safety boundaries and escalation

  • Fever, fluctuance, spreading cellulitis, urinary retention or pain not linked to defecation may indicate abscess or another emergency and warrants urgent examination.
  • Lateral or multiple fissures, a mass, immunosuppression, major weight loss or persistent nonhealing disease needs specialist investigation for secondary causes.
  • Topical nitrates can cause headache and hypotension and interact dangerously with phosphodiesterase-5 inhibitors; compounded calcium-channel-blocker products require reliable preparation and counseling.
  • Avoid uncontrolled sphincter division in a patient at elevated continence risk; tailored sphincterotomy or a sphincter-preserving operation requires colorectal expertise.
sources for this section:ascrs-anal-fissures-2023

Localization

US topical preparations may be compounded and availability varies; use current FDA and pharmacy standards even when the guideline evaluates a class. ASCRS procedure selection and US colorectal expertise govern escalation.
sources for this section:ascrs-anal-fissures-2023

Source documents

Use the linked source documents for complete recommendations, evidence grading, exclusions and implementation detail.

  1. American Society of Colon and Rectal SurgeonsClinical Practice Guidelines for the Management of Anal FissuresDOI 10.1097/DCR.0000000000002664 路 published 2023-02-01 路 accessed 2026-08-20
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