An anal fissure is a tear in the lining of the anus. Fissures typically cause severe pain and bleeding with bowel movements. Fissure is often confused with other causes of pain and bleeding, such as hemorrhoids.
Who is at risk for anal fissures?
Anal fissures can occur in anyone at any age. However, people with fissures are more likely to have them in the future.
What causes an anal fissure?
Fissures are usually caused by trauma to the inner lining of the anus. A hard, dry bowel movement is typically responsible, but loose stools and diarrhea can also be the cause. The injury to the tissue creates severe anal pain, resulting in anal sphincter spasms and a subsequent increase in anal sphincter muscle pressure. The increase in anal sphincter muscle pressure decreases blood flow to the injury site, thus impairing wound healing.
The trauma can be caused by one or more of the following:
- Chronic (long-term) constipation
- Straining during bowel movement, especially if the motions are hard and dry.
- Prolonged diarrhea
- Anal sex.
- Insertion of foreign objects into the anus.
- excessive tissue wiping of the anus after a motion
- Crohn’s disease
- Scratching (as a reaction to pinworm infection, for example)
- Anal injury
- Pregnancy
- Childbirth
What are the signs and symptoms of an anal fissure?
Signs and symptoms of an anal fissure include:
- Pain during, and even hours after, a bowel movement
- Constipation
- Blood on the outside surface of the stool
- Blood on toilet tissue or wipes
- A visible crack or tear in the anus or anal canal
- Burning and itching.
- Discomfort when urinating, frequent urination, or inability to urinate
- Foul-smelling discharge
What are the Complications of anal fissure?
Some of the possible complications of an anal fissure include the following:
- Chronic anal fissure – the tear fails to heal. Over time, this can cause extensive scar tissue at the fissure site (sentinel pile).
- Anal fistulas: An abnormal ‘tunnel’ joins the anal canal to the surrounding skin.
- Anal stenosis – the anal canal becomes abnormally narrowed due to a spasm of the anal sphincter or contraction of the resultant scar tissue.
How is an anal fissure diagnosed?
Usually, your doctor can diagnose an anal fissure by visually inspecting the anus or by gentle exam with the fingertip or an anoscope.
How are anal fissures treated?
Most fissures heal on their own and do not need treatment.The goal of anal fissure treatment is to lower the pressure on the anal canal by making stools soft and to ease discomfort and bleedingClinical guidelines on anal fissure management:
- Acute anal fissure: Non-operative treatment includes a high-fiber diet, stool softeners, and sitz baths.
- Chronic anal fissure: Topical agents like nitrates or calcium channel blockers
- A chronic anal fissure that fails to respond to medical therapy may be treated with botox or internal anal sphincterotomy.
Nonsurgical treatment of anal fissure?
Your doctor will discuss the benefits and side effects of treatments. Treatment includes:
- A high-fiber diet and over-the-counter fiber supplements (25-35 grams of fiber/day) make stools soft, formed, and bulky.
- Drinking more water helps prevent hard stools and aid in healing.
- Warm sitz baths for 10 to 20 minutes, a few times daily (especially after bowel movements to soothe the area and help relax anal sphincter muscles).
- Medications like lidocaine can be applied to the skin around the anus for pain relief.
- Medications such as diltiazem, nifedipine, or nitroglycerin ointment to relax the anal sphincter muscles help heal.
- Narcotic pain medications are avoided because they can cause constipation which could make the situation worse.
What does surgery for an anal fissure involve
Lateral internal sphincterotomy (Laser Surgery)
Precise and controlled division of the internal anal sphincter muscle is highly effective and commonly used to treat chronic and refractory anal fissures. Success rates are reported to be over 90%. Recurrence rates after sphincterotomy are exceedingly low when adequately performed by a surgeon. Now a days this procedure is done with laser. In this technique there is no open wound and so no suturing is required. The surgery is performed as an outpatient, same-day procedure. The principal risks of internal sphincterotomy are variable degrees of stool or gas incontinenc
How long is the recovery after surgery?
It is important to note that complete healing with medical and surgical treatments can take approximately 1-2 weeks. However, acute pain after surgery often disappears after a few days. Therefore, most patients can return to work and resume daily activities a few days after the surgery.
Fissures can recur easily, and it is pretty typical for a fully healed fissure to recur after a strenuous bowel movement or other injuries. Therefore, even when the pain and bleeding have subsided, it is crucial to continue good bowel habits and a diet high in fiber as a sustained lifestyle change.