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The anal sphincter is a complex part of the body that maintains a seal that can be opened to discharge body waste. It is strong enough to restrict the passage of any fecal material but sensitive enough to differentiate between solid, liquid, and gas. The anal sphincter is made up of two muscles—the internal and external anal sphincters. The internal sphincter is involuntary, while the external sphincter is a voluntary muscle that can be consciously controlled. Clenching these muscles for extended periods can cause anal pain, spasms, and even anal fissures, which can lead to a burning sensation.
| Characteristics | Values |
|---|---|
| Cause | Clenching of the anal sphincter muscles can be caused by chronic constipation, straining to poop, obstructed defecation syndrome, infant dyschezia, chronic diarrhea, childbirth, penetration, prior surgery, sexually transmitted infections (STIs), inflammatory bowel disease (IBD), anal cancer, tuberculosis (TB), diaper rash, and more. |
| Symptoms | Anal fissures, sharp pain, burning or itching, blood in stool, anal muscle spasms, a lump on the skin near the tear, electric or throbbing pain, rectal prolapse, pelvic floor dysfunction, pelvic floor organ prolapse, etc. |
| Diagnosis | Digital rectal exam, physical exam, imaging, anorectal manometry, etc. |
| Treatment | Establishing healthier bowel habits, medication to relax the sphincter muscles, physical therapy, surgery, Kegel exercises, supervised pelvic floor muscle training, natural vegetable powder, muscle relaxants, electrical stimulation, epidural nerve blocks, etc. |
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Anal fissures
The anal sphincter is a complex part of the body, consisting of two muscles: the internal and external sphincter. These muscles help control bowel movements by maintaining a seal that can be opened to discharge body waste. If these muscles are too tight, it can add tension to the anal lining, making it more susceptible to tearing and reducing blood flow to the tissues. This reduced blood flow can then inhibit healing.
When an anal fissure occurs, the exposed internal sphincter muscle beneath the tear goes into spasm, causing severe pain. This spasm pulls the edges of the fissure apart, making it challenging for the wound to heal and leading to further tearing of the mucosa during bowel movements. This cycle contributes to the development of chronic anal fissures in about 40% of patients.
Chronic anal fissures are those that last for six weeks or more and do not respond to conservative treatment. They may require a more aggressive approach, such as medicine, Botox injections, or topical treatments that improve blood flow to promote healing. It is important to note that the risks associated with Botox injections and medicines for treating anal fissures are generally mild. However, surgery carries a higher risk of infection, bleeding, and persistent gas and fecal incontinence.
To manage anal fissures, it is recommended to increase fiber and water intake to regulate bowel movements and reduce constipation and diarrhea. Avoiding spicy foods is also advised, as they may aggravate symptoms. In some cases, prescription creams may be prescribed for temporary pain relief.
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Pelvic floor dysfunction
The pelvic floor muscles support the bladder, bowel, and uterus, and prevent incontinence. They are located between the tailbone (coccyx) and the pubic bone within the pelvis. When the pelvic floor muscles contract, the internal organs are lifted, and the sphincters tighten the openings of the vagina, anus, and urethra. Relaxing the pelvic floor muscles allows for the easy passage of urine and feces. Pelvic floor dysfunction can occur when the pelvic floor muscles are too weak or too slow, or when they are working too hard or are overactive.
PFD can be caused by various factors, including pregnancy, childbirth, obesity, prostate cancer treatment, chronic constipation, and straining. Additionally, people with inherited deficiencies in their collagen type or weak connective tissue are at an increased risk for PFD. The use of muscle relaxants, narcotics, antihistamines, and anticholinergics may also contribute to PFD by causing urinary hesitancy and retention.
Therapeutic interventions for PFD should be tailored to the patient's specific needs, and a multidisciplinary approach is often necessary. Treatments may include pelvic floor exercises, lifestyle modifications (such as dietary changes and weight loss), medication, and surgery. The involvement of a sex therapist and a physical therapist specializing in pelvic floor disorders can also be invaluable to the management of PFD.
It is important to note that the term "pelvic floor dysfunction" has been criticized for its lack of specificity and recommended to be used with additional clarification in medical literature.
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Anal stenosis
The anal sphincter is a complex part of the body that maintains a seal that can be opened to discharge body waste. It is strong enough to restrict the passage of any fecal material but sensitive enough to differentiate between solid, liquid, and gas. There are two anal sphincter muscles: internal and external. The internal anal sphincter is an involuntary smooth muscle, like the muscles of the intestines, that contracts during rest and sleep, preventing the unexpected escape of small amounts of liquid and gas. The external anal sphincter is a voluntary muscle that a person can control. It is the muscle squeezed when one feels the urge to defecate but is not near a toilet.
Treatment options for anal stenosis include dietary changes, medication, and surgery. A high-fibre diet and fibre supplements can help soften stools, making them easier to pass. Stool softeners and emollient laxatives can also be used to add moisture to the stool. In severe cases, surgery, such as anoplasty or sphincterotomy, may be necessary. Anoplasty involves the surgical reconstruction of the anus, while sphincterotomy is a procedure in which the anal sphincter muscle is cut to open the anal canal.
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Anal Crohn's disease
The anal sphincter is a complex part of the body that maintains a seal that can be opened to discharge body waste. It is strong enough to restrict the passage of any fecal material but sensitive enough to differentiate between solid, liquid, and gas. There are two anal sphincter muscles: internal and external. The internal anal sphincter is an involuntary muscle, while the external anal sphincter is a voluntary muscle that you can control.
Perianal Crohn's disease can cause three levels of damage. The first level is tissue destruction, which includes anal fissures (cuts), skin tags, and deep ulcers. The second level results in abscesses, often associated with perianal fistulas. Complex fistulas may have multiple tunnels extending to other organs. The third level is rectal stricture, which can lead to constipation or fecal incontinence, serious infections, itching, and bleeding. While pain is a common symptom, some people with fissures may not experience it.
The management of perianal Crohn's disease requires a detailed understanding of perianal anatomy. Doctors will examine the anal area for inflammation, ulcers, skin tags, and signs of fistulas or fissures. Treatment options include antibiotics, immunosuppressive medications, and biologic medications to reduce inflammation and manage symptoms.
While clenched sphincter muscles were not specifically mentioned in the context of Anal Crohn's disease, it is known that muscle tension and anal spasms can pull anal fissures apart and reduce blood flow to the tissues, potentially leading to chronic fissures that require medical treatment. Therefore, it is possible that clenched sphincter muscles could contribute to the symptoms and complications associated with Anal Crohn's disease. However, further research is needed to establish a direct link.
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Proctalgia
Chronic proctalgia, on the other hand, is a long-lasting form of proctalgia. Episodes of chronic proctalgia usually last for more than 20 minutes and occur frequently. People with chronic proctalgia may experience discomfort after sitting for extended periods and may have painful bowel movements. The pain of chronic proctalgia is often described as a dull ache or pressure sensation high in the rectum, which is worse when sitting or standing.
Several treatments are available for proctalgia. Natural vegetable powder, in a dose of three heaping tablespoons per day, can help soften bowel movements and stretch out the muscles to prevent spasms. Muscle relaxants can also be used to achieve muscle relaxation. Electrical stimulation involves inserting a small probe into the rectum and passing a low-voltage vibrating current through the spastic muscles to relax them. Epidural nerve blocks involve injecting a solution into the pelvic area to numb the nerves and relieve pain.
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Frequently asked questions
Anal fissures are tears in the anal canal that cause symptoms such as sharp pain, burning or itching when passing stool, and fresh, red blood in the stool. Anal fissures can be caused by constipation, straining to pass stool, chronic diarrhoea, childbirth, penetration, surgery, and several other factors.
Anal fissures may be visible on a physical exam, during which a doctor will gently insert a lubricated, gloved finger to open the anus and notice any tenderness or muscle spasms.
Most anal fissures are acute and temporary, healing within a few days to weeks without any treatment beyond self-care. However, chronic anal fissures last more than eight weeks and may require treatment to relax the anal sphincter muscles, such as prescription creams, natural vegetable powder, muscle relaxants, electrical stimulation, or epidural nerve blocks.
