RSM-SPM-018
Written by Hironori Ikeda, MSc Sports Medicine
RSM International Academy · Chiang Mai, Thailand
What Should You Assess When a Swimmer's Shoulder Starts to Hurt?
Swimmer's shoulder pain may begin at hand entry, during the underwater pull or while recovering the arm above the water. A swimmer who hurts on the first stroke needs a different comparison from someone whose shoulder becomes painful only after repeated lengths.
I begin with the painful phase and the amount of swimming that brings it on, then compare cuff loading, scapular motion and thoracic movement. The question is which finding changes the treatment or training decision, rather than which muscle feels tightest.
This article explains the functional anatomy behind those comparisons, how to select a palpation target, when referral takes priority and how to distinguish a better clinic re-test from improved swimming tolerance.
In This Article
- What Should You Assess When a Swimmer's Shoulder Starts to Hurt?
- In This Article
- 1. Pain at Entry, Pull-Through or Recovery: Match the Muscle Demand
- 2. Scapular Motion and Thoracic Rotation: Find a Relevant Comparison
- 3. Cuff Loading and Palpation: Identify the Tissue before Choosing Pressure
- 4. Sports Massage around Swim Training: Choose a Testable Treatment
- 5. Re-Test the Same Shoulder Task, then Review Swimming Tolerance
- Related RSM Clinical Blogs
- Study Sports Massage at RSM
1. Pain at Entry, Pull-Through or Recovery: Match the Muscle Demand
I first ask the swimmer to identify the painful stroke and phase. In freestyle, pain while reaching after hand entry is a different starting point from pain during the underwater pull or recovery above the water. I also ask whether it begins immediately or only after several lengths, and whether distance, intensity, paddles or dry-land training recently changed.
During the pull-through, pectoralis major helps draw the elevated humerus inward and backward through glenohumeral adduction and extension; latissimus dorsi continues the extension as the arm travels toward the hip. During the forward reach, serratus anterior, running from the ribs to the scapula's medial border, helps the scapula move around the rib cage and rotate upward. Cuff activity helps control the humeral head against the glenoid throughout these changing demands.
Anatomy note: Pectoralis major has different regional roles: clavicular fibres have substantial flexion leverage, whereas lower-costal fibres can help extend the arm from a flexed position.
For pull-related pain, I can compare a gentle backward draw of the upper arm from a comfortable forward position, with the elbow bent and forearm supported, against light hand resistance. This tests tolerated shoulder extension, not water propulsion. A painful reach instead leads me to compare arm elevation. The phase guides the question without identifying an injured tissue; other strokes need their own assessment.
2. Scapular Motion and Thoracic Rotation: Find a Relevant Comparison
I observe the scapula while the swimmer raises and lowers the arm, then compare that with the reported stroke problem. A prominent border, early shrug or limited upper-back motion is a finding to investigate. Research in swimmers does not support treating one such finding as a reliable explanation for every painful shoulder.
For thoracic rotation, I ask the seated swimmer to turn the chest right and left while keeping the pelvis steady and the arms comfortably supported. I note restriction and familiar symptoms. This separates a trunk movement question from a shoulder-loading question; it does not reproduce the coordinated shoulder-and-hip roll used in the water.
I then repeat the original arm raise with only a small, comfortable change in upper-back extension. The arm plane, speed and load stay the same. If the familiar pain or attainable height changes, I record a useful modifier and return to the original position before re-testing. If nothing relevant changes, I do not keep treating thoracic stiffness as the answer.
Age and the testing method also matter. A 2024 systematic review found inconsistent or limited relationships for several scapular and trunk measures, with little evidence for masters swimmers. I therefore use these comparisons to guide an individual assessment, not to prescribe one posture or one body-roll angle to every swimmer.
3. Cuff Loading and Palpation: Identify the Tissue before Choosing Pressure
I compare active arm elevation, comfortable passive motion and tolerable resisted rotation. With the upper arm supported near the side and the elbow bent, turning the forearm outward loads the external rotators, including infraspinatus and teres minor. Familiar pain, pain-limited effort and a clear loss of force are different findings; none should be reduced to a tender knot.
Infraspinatus lies below the scapular spine and its tendon reaches the greater tuberosity of the humerus. I identify that bony ridge, support the forearm and use gentle contact over the muscle belly, distinguishing it from the more lateral tendon region. Its fibres run toward the upper humerus, so changing arm support changes the tissue under my hand. Tenderness supplements the movement and loading assessment; it does not confirm a tendon lesion.
I distinguish this posterior cuff region from the superficial latissimus at the posterior axillary fold. A pulling complaint is not a reason to press deeply into the axilla or under the scapula in search of subscapularis. If the selected tissue does not relate to the familiar complaint, I reconsider the target instead of extending the search through sensitive structures.
Trauma followed by inability to raise the arm, marked new weakness, repeated slipping or substantial passive-motion loss needs appropriate clinical assessment. Distal tingling or progressive neurological change calls for broader evaluation, including the neck when indicated. A massage trial should not delay referral for these findings.
4. Sports Massage around Swim Training: Choose a Testable Treatment
I record the stroke, distance before symptoms, use of paddles and next-day response before selecting contact. If a brief supported posterior-shoulder trial makes an easy reach comfortable, that does not establish tolerance for the next paddle set. I compare the agreed swim exposure separately, changing one demand at a time with the athlete's plan. When symptoms appear only after accumulated lengths, the training record may be more useful than searching for another restriction in a painless resting shoulder.
For the selected posterior-cuff belly, a teaching comparison can begin with the arm supported and broad, light contact. Pressure directed into the accessible muscle and a small tangential component along or across its fibres are separate from the path of a travelling stroke. Keep contact out of the axilla and away from the joint, adjusting the vector rather than simply pressing harder. With pressure reduced, the swimmer can perform a comfortable active rotation while the practitioner follows changing tension and excursion beneath the hand; this does not prove a restriction has been released. Stop the trial if sharp pain, tingling or spreading symptoms occur.
After contact, match the independent practice to the symptom comparison. For a reaching complaint, the swimmer can practise an easy arm raise, adding a small trunk turn only when that variation was relevant in the assessment. For a pull-related complaint, a short backward draw of the upper arm from a comfortable forward position may be more useful: keep the forearm supported and the elbow angle steady, using only a tolerable effort rather than reproducing the force of a swim stroke. The swimmer actively controls the movement; the scapula is not held in a prescribed position. These are practice options, not a replica of water propulsion or swimming clearance. Return to the original dry-land setup for the re-test. Before training, check that the trial has not increased irritability and ask about the next planned swim and recovery time.
A systematic review found small benefits for flexibility and delayed-onset muscle soreness, without evidence of direct improvement in strength, sprint or endurance performance. That is not proof of recovery from a painful cuff condition. I discuss massage as an optional part of care and keep appropriate rehabilitation and swim-load management in the plan.
5. Re-Test the Same Shoulder Task, then Review Swimming Tolerance
I repeat the original dry-land baseline with the same arm path, trunk position, resistance, speed and repetitions. For supported external rotation, the elbow position and hold duration also stay the same. I compare familiar pain and force tolerance; a lighter pull or a raise with added trunk extension remains a changed condition.
If the shoulder is comfortable on land but still becomes painful late in a swim, I have not answered the swimmer's main question. I review the agreed training exposure with the swimmer and relevant clinician or coach: stroke, pace, distance, rest and equipment. I record symptoms during and after that exposure without asking the swimmer to continue until pain becomes severe.
Changing paddles, reducing distance or adding rest may be sensible management, but those changes prevent a simple claim that massage caused the improvement. Progression back to full swimming needs an individual plan and response monitoring. If tolerance worsens or weakness or instability appears, I revisit assessment and referral rather than prescribe deeper contact or a universal mileage increase.
Related RSM Clinical Blogs
Browse all Sports Massage clinical guides
▷ Shoulder Pain Overhead: Scapula, Thorax & Rotator Cuff — Sports Massage · Compare painful arm elevation with cuff loading and scapular or thoracic conditions.
▷ Shoulder Pain Throwing / Serving: Cuff, Scapula & Training Volume — Sports Medicine Massage · Compare swimming with throwing and serving, where phase, rotation and training demand differ.
▷ Scapula Moves Differently in Sport: Dynamic Scapular Assessment — Sports Medicine Massage · Explore when changing scapular motion during repeated sport is relevant to symptoms.
Study Sports Massage at RSM
The Sports Massage Course at RSM International Academy in Chiang Mai develops hands-on reasoning around sport demands. The approach in this article connects the painful swimming phase with functional anatomy, treatment selection and a comparable re-test. See the Course Schedule for upcoming training.
The Trigger Point Therapy Course provides the clinical palpation foundation and is the listed prerequisite for Sports Massage. It develops the tissue-identification and contact skills needed before choosing pressure around the shoulder.
The Dynamic Posture Assessment & Kinetic Chain Training Course adds functional assessment and visual feedback. It complements the comparison of arm movement, trunk position and symptoms without relying on a resting posture alone.
About the Author
Hironori Ikeda, MSc Sports Medicine is the founder and lead instructor of RSM International Academy in Chiang Mai, Thailand. His teaching connects functional anatomy and clinical palpation with specific movement comparisons, treatment selection and re-testing.