Anal Fissure Treatment in Dallas, TX

Medically reviewed by Jaison John, MD — Board-Certified Gastroenterologist
Last updated: March 2026

What Is an Anal Fissure?

An anal fissure is a small tear or split in the thin, delicate tissue (anoderm) that lines the anal canal. Despite its small size, an anal fissure can cause significant pain — often described as sharp, cutting, or tearing — during and after bowel movements, along with bright red bleeding on the toilet paper or stool surface. Anal fissures are one of the most common anorectal conditions seen in gastroenterology and colorectal surgery practice, and they can affect people of any age, from infants to older adults.

Anal fissures are estimated to affect approximately 11% of the general population over a lifetime, making them nearly as common as hemorrhoids as a cause of rectal bleeding and anorectal discomfort. Despite their prevalence, many patients delay seeking medical care due to embarrassment or the assumption that their symptoms will resolve on their own. While many acute fissures do heal with conservative measures, chronic fissures — defined as those lasting longer than 6 to 8 weeks — often require medical therapy or procedural intervention to achieve healing.

At Texas Gut Health in Sachse, TX, Dr. Jaison John provides compassionate, evidence-based care for patients with anal fissures throughout the Dallas-Fort Worth area. Dr. John completed his gastroenterology fellowship at UT Medical Branch, where he served as Chief Fellow, and his internal medicine residency at UT Austin Dell Medical School, where he served as Chief Resident. He holds dual board certifications from the American Board of Internal Medicine in both internal medicine and gastroenterology. His approach emphasizes accurate diagnosis, distinguishing fissures from other anorectal conditions, and providing a stepwise treatment plan tailored to each patient's needs.

Anal Fissures vs. Hemorrhoids

Anal fissures and hemorrhoids are the two most common causes of rectal bleeding and are frequently confused by patients. While both conditions affect the anorectal area, they are fundamentally different in their nature, symptoms, and treatment.

• Anal fissures are tears in the anal lining that cause sharp, often severe pain during and immediately after bowel movements, along with bright red blood on the toilet paper. The pain is typically described as "like passing broken glass" and can last for minutes to hours after a bowel movement. The hallmark of a fissure is pain that is directly associated with defecation.
• Hemorrhoids are swollen, engorged blood vessels (vascular cushions) in the anal canal or around the anus. Internal hemorrhoids typically cause painless rectal bleeding (bright red blood that drips into the toilet) and may prolapse (protrude) through the anus. External hemorrhoids may cause pain, swelling, and itching, especially when they become thrombosed (develop a blood clot). Unlike fissures, hemorrhoids do not typically cause sharp, cutting pain with each bowel movement.

Because the symptoms of these two conditions can overlap, a proper examination by a gastroenterologist is essential for accurate diagnosis and appropriate treatment. Dr. John can distinguish between fissures, hemorrhoids, and other anorectal conditions during an office visit, ensuring you receive the right treatment for your specific condition.

Symptoms of Anal Fissures

The symptoms of an anal fissure are typically distinctive and, once recognized, can help guide both patients and clinicians toward the correct diagnosis.

• Sharp pain during bowel movements — The most characteristic symptom of an anal fissure is intense, sharp, tearing, or cutting pain that occurs during the passage of stool. The pain is often described as excruciating and may cause patients to dread or avoid bowel movements, which paradoxically worsens constipation and perpetuates the cycle of injury.
• Pain after bowel movements — After the initial sharp pain of defecation, many patients experience a deep, burning, or throbbing ache that can persist for minutes to several hours. This prolonged pain is caused by spasm of the internal anal sphincter muscle, which contracts in response to the tear.
• Bright red blood — Anal fissures typically produce small amounts of bright red blood that is visible on the toilet paper, on the surface of the stool, or dripping into the toilet bowl. The bleeding is usually minor but can be alarming to patients.
• Visible tear — In many cases, a small crack or tear can be seen in the skin around the anus, most commonly in the posterior midline (the 6 o'clock position when the patient is lying on their back).
• Itching or irritation — Some patients experience burning, itching, or irritation around the anus, particularly as the fissure begins to heal and then re-tears.
• Sentinel skin tag — Chronic fissures often develop a small tag of skin (sentinel pile) at the external edge of the fissure. This tag is sometimes mistaken for a hemorrhoid by patients.
• Fear of bowel movements — Because of the intense pain, patients may begin to avoid or delay bowel movements, leading to harder stools and worsening constipation — creating a vicious cycle that perpetuates the fissure.

Causes & Risk Factors

An anal fissure occurs when the delicate lining of the anal canal is torn, usually by mechanical trauma during a bowel movement. Once the initial tear occurs, a self-perpetuating cycle often develops: the tear causes pain, which triggers spasm of the internal anal sphincter muscle, which reduces blood flow to the injured area, which impairs healing, which allows the tear to deepen and become chronic.

Common Causes

• Constipation and hard stools — The passage of a hard, dry, or unusually large bowel movement is the most common cause of anal fissures. Straining during defecation further stretches the anal canal and increases the risk of tearing.
• Chronic diarrhea — Repeated episodes of loose, frequent stools can irritate and erode the anal lining, causing fissures. The acidic nature of diarrheal stool contributes to tissue breakdown.
• Childbirth — Vaginal delivery, particularly with a large baby or prolonged second stage of labor, can cause trauma to the perineum and anal canal, leading to fissures. Postpartum anal fissures are common and usually respond to conservative treatment.
• Anal intercourse — Trauma to the anal canal during anal intercourse can cause fissures.
• Internal anal sphincter hypertonia — In many patients with chronic fissures, the internal anal sphincter has abnormally high resting pressure (hypertonia). This increased tone reduces blood flow to the posterior midline of the anal canal (the area with the least robust blood supply), making it the most vulnerable location for fissure formation and the most difficult to heal.

Less Common Causes

• Crohn's disease — Anal fissures are a recognized complication of Crohn's disease and may be atypical in appearance (multiple fissures, lateral location, deep ulceration, or associated with fistulas or abscesses). Fissures in Crohn's disease may require different management than typical fissures.
• Infections — Sexually transmitted infections (syphilis, herpes simplex virus, HIV), tuberculosis, and other infections can cause anal ulceration that may resemble or be misdiagnosed as a fissure.
• Malignancy — Rarely, an anal ulcer that does not heal despite treatment may represent anal cancer. This is one reason why persistent, non-healing anal lesions warrant thorough evaluation.
• Reduced blood flow — Conditions that impair blood supply to the anorectal area (such as prior surgery, radiation therapy, or vascular disease) can predispose to fissure formation and impaired healing.

Risk Factors

• Age — Anal fissures are most common in young and middle-aged adults (20 to 40 years old) but can occur at any age, including in infants and children.
• Low-fiber diet — A diet low in fiber leads to harder, more compact stools that are more likely to cause tearing.
• Inadequate fluid intake — Dehydration contributes to hard stools and constipation.
• Pregnancy and postpartum period — Hormonal changes, increased pelvic pressure, and the trauma of delivery all increase fissure risk.
• Previous anal surgery — Prior anorectal procedures can alter the anatomy and function of the anal canal, increasing fissure risk.

How Anal Fissures Are Diagnosed

An anal fissure is typically diagnosed through a careful history and physical examination. In most cases, the diagnosis can be made without invasive testing.

Clinical History

Dr. John will ask about the character of your pain (sharp during defecation, aching afterward), the presence and amount of bleeding, your bowel habits (constipation, diarrhea, straining), dietary fiber and fluid intake, and any relevant medical history including prior anorectal conditions, inflammatory bowel disease, or immunosuppression. The classic history of sharp anal pain during and after bowel movements with a small amount of bright red blood is highly suggestive of an anal fissure.

Physical Examination

The diagnosis is usually confirmed by visual inspection of the perianal area. By gently separating the buttocks, Dr. John can often visualize the fissure directly. Most fissures occur in the posterior midline of the anal canal. Chronic fissures may show additional features such as a sentinel skin tag at the external edge, exposed internal sphincter fibers at the base of the fissure, and a hypertrophied anal papilla at the internal edge. A digital rectal examination may be performed if tolerated, though it may be deferred in patients with severe pain and performed under anesthesia if necessary.

Anoscopy

In some cases, anoscopy (insertion of a small, lighted scope into the anal canal) may be performed to more closely examine the fissure and rule out other anorectal pathology such as hemorrhoids, fistulas, or masses. Anoscopy is typically deferred in the acute setting if the patient is in significant pain and performed at a follow-up visit or under sedation.

Additional Testing

Further evaluation may be recommended in specific situations:

• Colonoscopy — A colonoscopy may be recommended for patients with rectal bleeding who are over age 45 (or earlier with risk factors), have atypical fissure features suggestive of Crohn's disease, or have bleeding that is not adequately explained by the fissure alone.
• Anorectal manometry — In patients with chronic, refractory fissures or in those being considered for sphincterotomy, anorectal manometry may be used to measure internal anal sphincter pressure and assess for sphincter dysfunction.
• Examination under anesthesia (EUA) — For patients with severe pain that prevents adequate office examination, an EUA allows thorough evaluation of the anal canal, biopsy of atypical lesions, and initiation of treatment.

Treatment Options

Treatment for anal fissures follows a stepwise approach, beginning with conservative measures and progressing to medical and procedural therapies based on the severity, duration, and response to initial treatment. The goals of treatment are to relieve pain, promote healing of the fissure, break the cycle of sphincter spasm and ischemia, and prevent recurrence.

Conservative Treatment (First-Line)

The majority of acute anal fissures will heal with conservative measures alone. These should be initiated as soon as a fissure is suspected or diagnosed:

• Dietary fiber supplementation — Increasing daily fiber intake to 25 to 35 grams per day with a fiber supplement (such as psyllium or methylcellulose) and fiber-rich foods (fruits, vegetables, whole grains, legumes) produces softer, bulkier stools that pass through the anal canal with less trauma. Fiber is the single most important conservative measure for fissure healing and prevention.
• Adequate hydration — Drinking at least 6 to 8 glasses of water per day helps keep stools soft and prevents constipation.
• Stool softeners — An over-the-counter stool softener (such as docusate sodium) or an osmotic laxative (such as polyethylene glycol) can be used in conjunction with fiber to ensure soft, easy-to-pass stools.
• Sitz baths — Soaking the anal area in warm (not hot) water for 10 to 15 minutes, two to three times daily and after bowel movements, helps relax the internal anal sphincter, improve blood flow to the fissure, and relieve pain. Sitz baths are a simple, effective, and comforting measure.
• Avoiding straining — Patients should avoid straining during bowel movements, limit time on the toilet, and respond promptly to the urge to defecate rather than delaying.

Medical Therapy (Second-Line)

When conservative measures alone are insufficient — particularly for chronic fissures — medical therapies are added to reduce internal anal sphincter tone and improve blood flow to the fissure site:

• Topical nitroglycerin ointment (0.2% to 0.4%) — Nitroglycerin acts as a nitric oxide donor that relaxes smooth muscle, including the internal anal sphincter. Applied to the anal canal two to three times daily for 6 to 8 weeks, topical nitroglycerin has been shown to heal chronic fissures in approximately 50% to 68% of patients. The most common side effect is headache, which occurs in up to 40% of patients and can limit compliance. The ACG recommends topical nitroglycerin as a first-line medical therapy for chronic anal fissures.
• Topical calcium channel blockers — Compounded topical diltiazem (2%) or nifedipine (0.2% to 0.3%) ointments reduce internal anal sphincter pressure and improve local blood flow. These medications have healing rates similar to topical nitroglycerin but with fewer headaches, making them a popular alternative. They are typically applied two to three times daily for 6 to 8 weeks.
• Botulinum toxin (Botox) injection — Injection of botulinum toxin directly into the internal anal sphincter temporarily paralyzes the muscle, reducing spasm and improving blood flow to the fissure. The effect typically lasts 2 to 3 months, providing a window for the fissure to heal. Healing rates range from 60% to 80%. Botox injection is a minimally invasive office procedure and is typically considered when topical therapies have failed or are not tolerated.

Surgical Treatment (Third-Line)

• Lateral internal sphincterotomy (LIS) — LIS is the gold standard surgical treatment for chronic anal fissures that have not responded to conservative and medical therapy. During this outpatient procedure, a small portion of the internal anal sphincter muscle is divided to permanently reduce sphincter pressure and restore blood flow to the posterior midline. LIS has the highest healing rate of any fissure treatment, exceeding 90% in most studies. The procedure is well tolerated, and most patients experience significant pain relief within days. The primary risk is a small chance (typically less than 10%) of minor fecal incontinence, usually limited to occasional difficulty controlling gas. This risk is why LIS is reserved for patients who have failed other treatments and is used cautiously in patients with pre-existing sphincter injury or weakness (such as elderly patients or women with obstetric sphincter injuries).
• Fissurectomy — Surgical excision of the fissure and associated sentinel skin tag and hypertrophied papilla, sometimes combined with advancement flap repair to cover the wound with healthy tissue. Fissurectomy may be considered for patients in whom sphincterotomy is contraindicated due to incontinence risk.

Frequently Asked Questions