Muscles
Sphincter Ani
Symptom Area: Torso
Anal sphincter muscle; trigger points cause local anal and perineal pain, often described as a deep cramping ache.
Overview
The external anal sphincter surrounds the anal canal and maintains continence under voluntary control, blending with the puborectalis sling and the perineal body. Persistent overactivity here contributes to proctalgia and chronic perineal pain.
Trigger point locations
Points in the sphincter ring and in the adjacent perineal body, found on internal rectal examination.
Referred pain pattern
Local pain in and around the anus and perineum, sometimes deep cramping episodes that are worse when sitting or during bowel movements.
Palpation & testing
Rectal palpation by an appropriately trained clinician, assessing resting tone and tender bands quadrant by quadrant.
Common causes
Chronic straining and constipation, haemorrhoids or fissures, childbirth or anorectal surgery, habitual clenching under stress, prolonged sitting.
Self-care & clinical treatment
Bowel habit and fibre management to avoid straining, warm baths, down-training the pelvic floor with diaphragmatic breathing. Clinically: internal manual release by a pelvic health specialist and colorectal assessment to exclude local pathology.
Treatment protocol
Evidence-based options, dosage and safety limits for this muscle. Educational content — not a substitute for individual clinical assessment.
Manual trigger point release
Position Sphincter Ani in a shortened, fully supported position, locate the taut band across the fibres and hold the most tender nodule between finger and thumb (pincer grip) or against the underlying bone (flat palpation).
Apply sustained pressure release at an intensity the person rates 4-6/10, holding 30-60 seconds until the discomfort fades by roughly half, then release slowly. Repeat 2-3 times per point, once or twice a day. Follow each release with slow active movement through the full available range rather than stopping at the pressure itself.
Manual release, ischaemic compression and soft tissue technique reduce trigger point pain and pressure-pain threshold in systematic reviews, with effect sizes comparable to needling in the short term; combining manual work with movement retraining is what maintains the gain.
Charles 2019 · Simons & Travell · Shah 2015
Stretch, heat and movement dosage
Warm the area for 10-15 minutes (shower, hot pack) before stretching Sphincter Ani: warm tissue tolerates the lengthening better and the post-release window is when range is easiest to gain.
Hold each stretch 30 seconds, 3 repetitions, 5-7 days a week, to the first firm resistance and never into referred pain. Add low-load isometrics or slow controlled repetitions in the newly gained range on the same day, then progress load once the daily pain pattern has settled.
Reassess after 2 weeks. If the trigger point keeps returning to the same spot, the driver is usually postural load, sustained shortening or an unaddressed perpetuating factor rather than the point itself.
Simons & Travell · Fernández-de-las-Peñas 2019
Dry needling and injection (clinician only)
Clinician onlyTrigger point dry needling of Sphincter Ani is performed only by a clinician licensed for it, with clean-needle technique and informed consent. The taut band is fixed between the fingers and the needle advanced into the nodule; eliciting local twitch responses is associated with the largest immediate drop in pain and in spontaneous electrical activity.
Typical dosage in the trials is 1-2 sessions per week for 3-6 sessions, reassessing function each time, rather than open-ended treatment. Meta-analyses in upper-quarter and multi-region myofascial pain show reduced pain and improved pressure-pain threshold in the short and medium term compared with sham or no treatment.
Injection with local anaesthetic gives comparable pain relief to dry needling with less post-needling soreness; corticosteroid is not required for myofascial trigger points. Expect 24-72 hours of local soreness after needling and tell the person so in advance.
Kietrys 2013 · Gattie 2017 · Boyles 2015 · Cagnie 2013 · Hong 1994
Precautions and contraindications
Over the rib cage the only safe needling direction is tangential or onto a rib; perpendicular needling of an intercostal space risks pneumothorax. Breast tissue, the intercostal neurovascular bundle at the lower rib border and the anterior chest wall in thin patients need particular care.
Do not press or needle over broken or infected skin, an acute haematoma, a suspected fracture, a joint replacement approach, a tumour site, lymphoedema or an area with lost sensation. Anticoagulation, bleeding disorders, needle phobia, pregnancy, uncontrolled diabetes and immunosuppression all require the technique to be modified or avoided.
Documented adverse events after dry needling are mostly mild (bleeding, bruising, post-needling soreness, brief autonomic symptoms); serious events are rare and almost always relate to depth and direction in a thoracic or vascular field. Stop and seek urgent assessment for new breathlessness or chest pain, spreading numbness or weakness, fever, or a rapidly expanding swelling.
This page is educational and does not replace an individual clinical assessment. Progressive night pain, unexplained weight loss, cancer history, recent trauma or bladder and bowel change need medical evaluation before any trigger point treatment.
Halle 2016 · Boyce 2020
Sources for this protocol
- Effectiveness of dry needling for upper-quarter myofascial pain: a systematic review and meta-analysis — J Orthop Sports Phys Ther 2013;43(9):620-34
- The effectiveness of trigger point dry needling for musculoskeletal conditions by physical therapists: a systematic review and meta-analysis — J Orthop Sports Phys Ther 2017;47(3):133-49
- Effectiveness of trigger point dry needling for multiple body regions: a systematic review — J Man Manip Ther 2015;23(5):276-93
- A systematic review of manual therapy techniques, dry cupping and dry needling in the reduction of myofascial pain and myofascial trigger points — J Bodyw Mov Ther 2019;23(3):539-46
- Physiologic effects of dry needling — Curr Pain Headache Rep 2013;17(8):348
- Trigger point dry needling for the treatment of myofascial pain syndrome: current perspectives within a pain neuroscience paradigm — J Pain Res 2019;12:1899-911
- Myofascial trigger points then and now: a historical and scientific perspective — PM R 2015;7(7):746-61
- Pertinent dry needling considerations for minimizing adverse effects — Int J Sports Phys Ther 2016;11(5):651-62
- Adverse events associated with therapeutic dry needling — Int J Sports Phys Ther 2020;15(1):103-13
- Lidocaine injection versus dry needling to myofascial trigger point: the importance of the local twitch response — Am J Phys Med Rehabil 1994;73(4):256-63
- Myofascial Pain and Dysfunction: The Trigger Point Manual (2nd ed.) — Williams & Wilkins, Baltimore
Primary Symptoms
Related muscles in this region
References
- • triggerpoints.net — reference
Medically reviewed by: Physio Energy clinical team — physiotherapists specialised in myofascial pain · Last reviewed:

