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Atlas · Shoulder

Deltoid

Deltoid covers the shoulder and helps lift the arm forward, sideways and backward. Pain over this region may reflect muscle load, cuff or joint disease, or an axillary-nerve injury. Compare movement, strength and sensation before selecting local care.

Deltoid
Body region
Shoulder
Trigger points
6
documented in this muscle
Common symptoms
3
patterns cataloged
Contributors
3
Factors to assess

Muscle overview

Symptoms and first steps

Practical first steps

  • Temporarily lower the weight or height of painful pressing tasks.
  • Use supported, comfortable arm movement during the day.
  • Restore repetitions and then load as movement tolerance improves.

When to seek assessment

  • Traumatic deformity, severe pain or inability to move the shoulder requires prompt care.
  • New deltoid wasting, marked abduction weakness or numbness over the lateral shoulder needs examination.

A lateral shoulder pain location does not identify deltoid as the source. Preserved passive motion with weak active elevation requires strength and neurological assessment.

Examination, palpation and treatment evidence

Illustrated overview

Deltoid

Blue highlights the muscle. Crosses mark representative trigger-point sites; shaded areas show possible referred pain. These examples do not correspond one-to-one with the numbered points below. Patterns vary and cannot diagnose the cause of pain.

Illustrated overview

Deltoid · Anatomy 1

Anatomical view of the illustrated muscle.

Open full-size image

Trigger points

1. TrP1

Location. Front of shoulder

Trigger point map
Deltoid — Trigger point mapOpen full-size image

Shared diagram of this muscle region; it may show several trigger points.

Referred pain map
Deltoid — Referred pain mapOpen full-size image

Shared diagram of this muscle region; it may show several trigger points.

Pain referral. Front and outer shoulder

Pain Pattern

  • Front of shoulder
  • Outer arm
  • Deltoid insertion

What This Pain Feels Like

Forward lifting, pushing or overhead use may provoke anterior or lateral shoulder pain. Examine deltoid loading together with the rotator cuff and joint, particularly when pain is accompanied by weakness or restricted motion.

What Patients Report

  • Pain when lifting arm forward
  • Pain at front of shoulder
  • Difficulty with push-ups

What Makes It Worse

  • Forward lifting
  • Push-ups
  • Overhead pressing
  • Carrying heavy items
Browse related exercises (24)

Symptoms patients report

Pain during arm elevation Record the height and direction of the painful movement.

Soreness after increased pressing or raises Relate symptoms to the change in training volume and recovery.

Weakness or altered lateral-shoulder sensation These findings need a neurological and injury assessment.

Contributors to assess

Increased overhead load Review presses, lateral raises and work above shoulder height.

Shoulder injury or instability A prior dislocation can affect cuff and axillary-nerve function.

Reduced tolerance for repeated elevation Consider strength, fatigue and task duration rather than assuming a fixed postural cause.

For clinicians and supervised training

Clinical reference

Tenderness over the deltoid can coexist with a shoulder disorder. Sudden weakness after injury should not be managed as routine post-exercise soreness.

Anatomy and palpation

Anatomical relationships

Anterior, middle and posterior deltoid fibers arise from the lateral clavicle, acromion and scapular spine, converging on the deltoid tuberosity. They contribute to shoulder flexion, abduction and extension, with rotational actions varying by part.[1][2][3]

  • Lateral clavicle, acromion and scapular spine define the proximal attachments.
  • Deltoid tuberosity lies on the lateral humerus below the shoulder cap.

Nearby structures. The rotator cuff and subacromial-subdeltoid bursa lie deep to the muscle. The axillary nerve and posterior circumflex humeral vessels pass deep around the proximal humerus.

Palpation

Patient position. Seated with forearm supported; use comfortable forward or sideways arm positioning to expose the region being examined.

Find the landmarks

  • Orient to the acromion and lateral clavicle before following anterior or middle fibers.
  • Use the scapular spine to orient to posterior deltoid, then follow toward the lateral humerus.

Examination sequence

  1. Inspect contour and skin before touching the area.
  2. Use a gentle forward, sideways or backward effort to identify the relevant superficial fibers, then relax.
  3. Compare light pressure and retest the same arm movement; record tenderness separately from strength or sensory loss.

Document the findings

  • Localized effort-related soreness differs from a broad painful arc or a neurological deficit.

Limits and precautions

  • Avoid deep pressure under the posterior shoulder cap or forceful testing after dislocation or suspected fracture.
[1][2][3]

Examination and tests

2

Active versus assisted shoulder elevation[2]

Separate loss of active control from restriction of available shoulder motion.

Position
Seated or supine, trunk supported and thumb pointing upward.
Technique
Observe a slow lift in the scapular plane. Then support the arm and compare comfortable assisted motion, noting pain, available range and shoulder hiking.
Positive finding
Active range is substantially less than assisted range, or both are restricted.
Interpretation
A large active deficit prompts cuff, deltoid and nerve assessment; marked restriction of both suggests joint or capsular involvement.
Limitations
Pain inhibition affects movement. This comparison does not isolate deltoid or diagnose a trigger point.

Supported abduction strength and lateral-shoulder sensation[1][3][2]

Screen deltoid activation and accompanying axillary-nerve findings.

Position
Arm supported in modest abduction with the elbow bent; avoid a painful end position.
Technique
Ask for a gentle outward hold against resistance above the elbow. Compare contraction and force, then compare light touch over the upper lateral arm on both sides.
Positive finding
Clear weakness or poor contraction, especially with altered lateral-shoulder sensation after trauma.
Interpretation
Combined motor and sensory findings warrant assessment for axillary-nerve injury; cuff disease and pain inhibition remain alternatives.
Limitations
Normal sensation does not exclude a motor lesion, and shoulder abduction also recruits the cuff.

Distinguishing other causes

Rotator cuff-related pain or tear[2]

Findings that matter. Painful elevation, night pain or cuff-loading weakness extending beyond one superficial tender site.

Next step. Complete a shoulder examination; investigate traumatic or substantial weakness.

Axillary neuropathy after shoulder injury[3][1]

Findings that matter. Deltoid weakness or wasting with or without lateral-shoulder sensory loss, particularly after dislocation.

Next step. Assess neurological function and arrange follow-up for persistent motor deficit.

Glenohumeral stiffness[2]

Findings that matter. Active and passive movement are restricted, including external rotation.

Next step. Assess the joint/capsule and adapt rehabilitation to available movement.

Local muscle injury[2][3]

Findings that matter. Focal pain, bruising or tenderness after a discrete load or direct impact.

Next step. Examine injury severity and rebuild load after significant tear or fracture is excluded.

Treatment selection and progression

Self-care and activity

Reduce the height and load of painful lifting[2]

Consider when. Assessed load-related shoulder pain with stable strength.

Lower the working height, use two hands and reduce the weight of painful raises or presses while preserving comfortable movement.

Dose and review
Test one modification during several ordinary tasks.
Progression
Restore the movement range before combining high repetitions and heavier load.
Stop or reassess
Reassess persistent or progressive weakness.
Evidence and limits
Individualized activity modification is part of shoulder rehabilitation; response to a task change guides its use.

Exercise and rehabilitation

Graded shoulder elevation[2][1]

Consider when. Stable shoulder pain after significant injury and neurological weakness have been assessed.

Begin with an assisted table slide or a short, comfortable thumb-up raise. Progress to light resistance in the direction required by daily tasks.

Dose and review
A starting example is one set of 6–8 controlled repetitions, adjusted to pain and next-day tolerance.
Progression
Increase comfortable range, then resistance, and finally repeated overhead work.
Stop or reassess
Reduce the dose for sustained worsening; new loss of active elevation needs examination.
Evidence and limits
Active rehabilitation is supported for rotator cuff-related pain. This exercise selection is a regional adaptation, not proof of isolated deltoid treatment.

Clinician-delivered care

Manual shoulder care for associated rotator cuff pain[2]

Consider when. Assessed rotator cuff-related shoulder pain with movement limited by pain or a relevant mobility deficit.

A clinician may use tolerable shoulder joint mobilization or accessible soft-tissue work, followed by the same elevation task and active exercise.

Dose and review
The guideline gives no single technique or visit dose; agree on a short trial with movement reassessment.
Progression
Continue only when relief helps exercise or daily activity, then reduce hands-on treatment as loading improves.
Stop or reassess
Stop increasing pain, new paresthesia or instability symptoms.
Evidence and limits
The 2025 guideline permits regional manual therapy for short-term pain relief. It does not establish isolated deltoid release or lasting benefit from massage alone.

Reassessment and follow-up

  • Record active and assisted elevation range in the same plane.
  • Compare supported abduction force and any lateral-shoulder sensory change.
  • Track the height, load and repetitions of a chosen reaching or pressing task and its next-day response.

Evidence and sources

  1. University of Washington Muscle Atlas: Deltoid

    2026 · University anatomical reference

    Accessed September 2026; access year. Supports attachments, actions and innervation. Examination contacts and starting exercises below are clinical adaptations, not validated trigger-point tests.

  2. Rotator Cuff Tendinopathy Diagnosis, Nonsurgical Medical Care, and Rehabilitation: A Clinical Practice Guideline

    2025 · Clinical practice guideline

    Assessment, education and active rehabilitation for rotator cuff tendinopathy. Recommendation 26 permits regional manual therapy for short-term pain relief; no isolated deltoid or latissimus effect or universal manual dose is established.

  3. AAOS OrthoInfo: Shoulder Dislocation

    2026 · Orthopaedic society patient guidance

    Accessed September 2026; access year. Traumatic deformity, movement loss and neurological symptoms require assessment; supports the differential after shoulder injury.

Associated Trigger Points