Most anal fissures heal on their own within a few weeks if you can break the cycle that keeps them irritated. The key is softening your stool, relaxing the muscle that surrounds the tear, and keeping the area clean without further trauma. Here’s what actually works, starting with what you can do right now.
Why Fissures Hurt So Much
An anal fissure is a small tear in the lining of the anal canal, usually caused by passing a hard or large stool. The pain doesn’t stop after the bowel movement because the tear triggers the internal anal sphincter (the ring of muscle around the opening) to go into spasm. That spasm pulls the edges of the tear apart, restricts blood flow to the area, and slows healing. The reduced blood flow means the tissue can’t repair itself efficiently, so the next bowel movement re-injures the same spot. This spasm-pain-reinjury loop is what makes fissures persist and why treatment targets both the tear and the muscle tension around it.
Sitz Baths for Immediate Relief
A sitz bath is the single fastest way to ease fissure pain at home. Fill a bathtub or a basin that fits over your toilet with a few inches of warm water, around 104°F (40°C). Sit in it so the water covers your anal area for 15 to 20 minutes. The warmth relaxes the sphincter muscle, improves blood flow to the tear, and temporarily breaks that spasm cycle.
For active pain, aim for three to four sitz baths a day, especially after bowel movements. You don’t need to add anything to the water. Epsom salts are sometimes suggested, but plain warm water works. Pat the area dry afterward with a soft towel rather than rubbing.
Soften Your Stool With Fiber and Water
Hard stool is what caused the tear in the first place, and it will keep reopening it. Most people need 25 to 30 grams of fiber per day, and the average diet falls well short of that. You can close the gap with fruits, vegetables, beans, whole grains, or a fiber supplement like psyllium husk. Increase fiber gradually over a week or two to avoid bloating and gas.
Fiber only works if you’re drinking enough water. Without adequate fluid, extra fiber can actually make stool firmer. There’s no single magic number, but aiming for eight glasses a day is a reasonable baseline, and more if you’re active or in a hot climate. An over-the-counter osmotic laxative (the kind that draws water into your bowel, like polyethylene glycol) can also help keep stools soft during the healing window. Traditional stool softeners containing docusate are widely used but have limited evidence for actually treating constipation. They’re better for preventing straining than for resolving it.
Gentle Cleaning After Bowel Movements
How you clean afterward matters more than you might think. Rough wiping with dry toilet paper can re-traumatize the fissure every single day. Use soft toilet paper with gentle motions, unscented moist wipes, or a bidet if you have one. A bidet or a squeeze bottle of warm water directed at the area is ideal because it cleans without any friction at all. Pat dry with a soft cloth afterward.
Avoid scented wipes, alcohol-based products, witch hazel, and anything that isn’t a mild cleanser or warm water. These can irritate the already-damaged tissue and slow healing.
Topical Treatments That Relax the Sphincter
When home measures aren’t enough, prescription ointments target the sphincter spasm directly. The most common option is nitroglycerin ointment, applied inside the anal canal every 12 hours. It works by relaxing the sphincter muscle and increasing blood flow to the tear. The main downside is headaches, which are common enough that some people can’t tolerate it.
Calcium channel blocker ointments (typically containing nifedipine or diltiazem) are an alternative that tends to cause fewer side effects. In one study, a nifedipine-based ointment healed chronic fissures in about 95% of patients after six weeks, with almost no systemic side effects like headaches or dizziness. These are usually compounded by a pharmacy and applied in a similar way. Your doctor can help decide which option fits your situation.
Acute vs. Chronic: When the Timeline Matters
A fissure that has lasted less than eight weeks is considered acute. Most acute fissures heal with the conservative steps above: sitz baths, fiber, water, gentle hygiene. The majority close up within four to six weeks.
Once a fissure passes the eight-week mark without healing, it’s classified as chronic. Chronic fissures often develop thickened edges or a small skin tag near the tear, and they’re much less likely to resolve with lifestyle changes alone. At this stage, treatment shifts toward actively relaxing the sphincter with topical medications or procedures.
Procedures for Fissures That Won’t Heal
If prescription ointments don’t work, the next step is usually an injection of botulinum toxin into the sphincter muscle. A typical dose is 20 units injected near the fissure. This temporarily paralyzes part of the muscle, giving the tear a window to heal without constant spasm. The effect wears off over several months, but by then the fissure has often closed.
For fissures that fail all other treatments, a minor surgery called lateral internal sphincterotomy is the most reliable fix. The surgeon makes a small cut in a portion of the internal sphincter to permanently reduce its resting tension. It has a 95% success rate for curing chronic fissures. Long-term complications are rare, occurring in fewer than 5% of cases. The most common concern is minor leakage of gas or small amounts of stool during recovery, which resolves for most people but can persist in a small number.
Daily Habits That Prevent Recurrence
Once a fissure heals, it can come back if the conditions that caused it return. Keeping fiber intake at 25 to 30 grams daily and staying well hydrated are the most effective long-term strategies. Avoid straining or sitting on the toilet for extended periods. If you feel the urge to go, don’t delay it, because waiting can lead to harder stool.
During a bowel movement, let gravity do the work rather than bearing down. A small footstool under your feet can raise your knees above your hips, which straightens the angle of the rectum and makes passing stool easier. This simple positioning change reduces the pressure on the anal canal and lowers the chance of re-tearing healed tissue.
If you notice blood on the toilet paper, sharp pain during bowel movements, or a fissure that hasn’t improved after several weeks of home care, it’s worth getting evaluated. A fissure that won’t heal past eight weeks typically needs prescription treatment to break the spasm cycle, and the sooner that starts, the better the outcome.