Shoulder Pain When Swimming: Causes, Technique Fixes, and Exercises

Swimmer's shoulder affects up to 90% of competitive swimmers at some point. But you don't have to be competitive to get it—recreational swimmers, triathletes, and occasional lap swimmers are all susceptible. The good news: most cases are fixable with technique changes and the right exercises.

What Is Swimmer's Shoulder?

"Swimmer's shoulder" is an umbrella term for shoulder pain from swimming. It typically involves:

Rotator cuff tendinopathy: Overuse of the rotator cuff muscles
Subacromial impingement: Pinching of tissues under the shoulder bone
Scapular dysfunction: Shoulder blade not moving properly
Labral irritation: In more severe cases

These often occur together and have similar solutions.

Where Does It Hurt?

Front of Shoulder

Often biceps tendon or anterior impingement
Worse during the catch and pull phases
May indicate internal rotation overload
Check for tight pecs, poor thoracic mobility

Top of Shoulder

Could be AC joint or supraspinatus tendon
Pain during arm entry and recovery
Often technique-related (thumb-first entry, crossing midline)

Back of Shoulder

Less common
Could be posterior impingement
May relate to follow-through technique

Deep in Shoulder

May indicate more significant pathology
Labral involvement possible
Worth getting assessed if persistent

The Usual Causes

1. Technique Errors

Hand Entry - Crossing Midline

When your hand enters the water crossing your body's centerline, it internally rotates and elevates your shoulder, pinching the rotator cuff.
Fix: Enter with hand in line with your shoulder, not crossing to the opposite side

Thumb-First Entry

Entering thumb-first puts the shoulder in internal rotation under load
Fix: Enter fingertips first, palm facing down or slightly out

Dropped Elbow During Catch

A low elbow during the catch puts more stress on the shoulder
Fix: High elbow catch—keep elbow higher than wrist

Overreaching

Excessive extension on each stroke overloads the shoulder
Fix: Shorter, more controlled stroke; don't hyperextend

Head Position

Lifting head too high to breathe rotates the body excessively
Fix: One goggle in water when breathing; rotate from body, not neck

2. Training Errors

Too Much Too Soon

Sudden increase in yardage or intensity
Rule: Increase volume no more than 10% per week

Too Many Paddles/Resistance Tools

Paddles significantly increase load on shoulders
Limit paddle use, especially when shoulder is sensitive

Insufficient Rest

Tendons need recovery time
Include rest days and easy days

All Freestyle

Repetitive stroke pattern without variation
Mix in backstroke, breaststroke (if tolerated), kick sets

3. Physical Deficits

Weak Rotator Cuff

Can't stabilize shoulder during high repetition
Leads to impingement

Tight Pecs and Lats

Limit shoulder mobility
Force shoulder into impingement positions

Poor Scapular Control

Shoulder blade doesn't upwardly rotate properly
Creates subacromial crowding

Limited Thoracic Mobility

If mid-back is stiff, shoulder compensates
Common in desk workers who swim

Weak Lower Traps and Serratus

Can't support proper scapular positioning
Rotator cuff works harder to compensate

Exercises for Swimmer's Shoulder

Rotator Cuff Strengthening

Side-Lying External Rotation

Lie on your side, affected arm on top
Elbow bent 90°, resting on your side
Rotate forearm up toward ceiling
3 x 15 with light weight (1-5 lbs)
Slow and controlled

Standing External Rotation (Band/Cable)

Elbow at side, forearm across body
Rotate out against resistance
Keep elbow pinned to side
3 x 15

Prone Y-T-W Raises

Lie face down, arms hanging off bench or bed
Y: Arms 45° overhead, thumbs up, lift 10x
T: Arms straight out, thumbs up, lift 10x
W: Elbows bent, squeeze shoulder blades, lift 10x
Light or no weight initially

Scapular Strengthening

Face Pulls

Cable or band at face height
Pull toward face, separating hands
Elbows high, squeeze shoulder blades
3 x 15-20
The best exercise for swimmers

Band Pull-Aparts

Band in front, arms extended
Pull apart by squeezing shoulder blades
3 x 15-20
Can do daily

Serratus Punches

On back holding weight above chest
Punch ceiling, protracting shoulder blade
3 x 15
Strengthens serratus anterior

Wall Slides

Back against wall, arms in goalpost position
Slide arms up and down, maintaining wall contact
3 x 10 slow reps
If you can't keep hands on wall, work on mobility first

Mobility Work

Doorway Pec Stretch

Forearm on doorframe, elbow at shoulder height
Step through doorway
Hold 30-60 seconds each side
Do at three heights: low, medium, high

Lat Stretch

Hold onto a bar or doorframe
Sink hips back and away
Hold 30-60 seconds each side

Thoracic Spine Rotation

On hands and knees
Thread one arm under your body
Rotate, reaching through
10 reps each side

Thoracic Extension on Foam Roller

Roller across mid-back
Support head with hands
Extend over roller
10-15 reps, moving roller up slightly each time

Sleeper Stretch (for internal rotation)

Lie on your side, shoulder under you
Arm at 90°, forearm pointing up
Gently push hand toward floor
Hold 30 seconds
Don't force—be gentle

Pre-Swim Activation Routine (5 Minutes)

Do this before every swim:

Arm circles: 10 each direction
Band pull-aparts: 15 reps
External rotation (band): 10 each arm
Wall slides: 8 reps
Thoracic rotation: 5 each side
Pec stretch: 20 seconds each side

Technique Drills for Healthy Shoulders

Fingertip Drag Drill

Freestyle with fingertips dragging through water during recovery
Keeps elbow high
Reinforces proper recovery mechanics

Catch-Up Drill

Don't start the pull until the other hand catches up
Prevents overreaching
Encourages rotation from core

Single-Arm Drill

Swim with one arm only, other at side
Focus on high elbow catch
Feel proper rotation

6-Kick Switch

6 kicks on side, then switch
Emphasizes rotation
Reduces shoulder-only power

Tarzan/Head-Up Freestyle

Head above water
Forces high elbow and strong catch
Don't overdo—taxing on shoulders if done too much

Training Modifications When Shoulder Hurts

Reduce Load

Cut yardage by 25-50%
No paddles or resistance tools
Slower, easier swimming
More kick sets

Change Strokes

Backstroke often relieves symptoms
Breaststroke may or may not help (depends on individual)
Kick sets with board (if tolerated)
Pull buoy may help or hurt—experiment

Continue Land Training

Shoulder exercises (rotator cuff, scapular)
Stretching
Core work

Return Protocol

When pain-free at rest and with daily activities:

Week 1: 50% normal yardage, easy effort, no paddles
Week 2: 70% yardage, some moderate effort
Week 3: 85% yardage, normal intensity variety
Week 4: Full training if no symptoms

Prevention Going Forward

Warm up before every swim: 5-minute activation routine
Maintain shoulder strength: Rotator cuff exercises 2-3x/week
Vary your strokes: Don't swim only freestyle
Progress gradually: 10% rule for volume increases
Limit paddle use: Especially early in season
Get technique feedback: Video analysis or coaching
Address desk posture: Swimming doesn't undo 8 hours of slouching

Red Flags: When to See a Doctor

Shoulder feels unstable or like it might "slip out"
Significant weakness (can't lift arm)
Night pain that wakes you
No improvement after 4-6 weeks of modifications
Numbness or tingling in arm
Pain after trauma or sudden pop

Key Takeaway

Swimmer's shoulder is almost always multifactorial: technique errors, training mistakes, and physical deficits all contribute. The solution requires addressing all three: fix your hand entry and catch mechanics, reduce training load, and strengthen your rotator cuff and scapular stabilizers. Most cases resolve within 4-8 weeks with consistent effort. If you keep getting injured, invest in stroke analysis with a coach—technique issues you can't feel may be obvious on video.