Swimmer's Shoulder: A Parent's Prevention Guide

Rafa was 11 the first time she said her shoulder hurt. We had just driven home from a heavy Saturday practice, two hours of long course freestyle and pull sets. She was doing that thing where she would rotate her arm in slow circles and grimace a little. "It feels weird, dad. Not bad. Just weird."

I almost said "you are fine, just stretch it out." I am very glad I did not.

Shoulder pain is the most common complaint in competitive swimming. It is also one of the most ignored, especially in age group swimmers, because the early signs are easy to miss and easy to dismiss. By the time it is "real" pain, it has often already become a problem.

Here is what swimmer's shoulder actually is, why young athletes are particularly at risk, and what you can do as a parent to help prevent it.

A note before we start: This article is for information, not medical advice. If your swimmer is in pain, see a sports physician or qualified physiotherapist. Do not wait it out.

What Is Swimmer's Shoulder?

"Swimmer's shoulder" is a catch-all term for the shoulder pain that competitive swimmers develop from the repetitive overhead motion of freestyle, backstroke, and butterfly. The clinical name is most often subacromial impingement, which means the rotator cuff tendons get pinched under the bony arch at the top of the shoulder blade with each stroke. Rotator cuff strain, biceps tendinopathy, and labral irritation also fall under the same umbrella.

The mechanics are straightforward. Elite swimmers may cover up to 14,000 metres and about 2,500 shoulder rotations a day (Stirling et al., 2024). Age groupers do far less, but it still adds up to a huge number of repetitions, and even a small technique flaw or muscle imbalance gets multiplied across all of them. The shoulder is one of the most mobile joints in the human body, which makes it powerful, but also vulnerable when it is loaded the same way over and over.

Why Young Swimmers Are at Higher Risk

A 2020 systematic review of 12 studies (1,460 swimmers) found that adolescent swimmers, aged 15 to 17, had the highest rates of shoulder pain of any age group, and that in teens, more weekly training volume went with more shoulder pain (Feijen et al., 2020).

Individual studies vary a lot depending on how they ask the question:

Sources: Stirling et al., 2024; Tessaro et al., 2017.

A few things drive this risk in young swimmers:

• Training volume jumps. Moving up a training group can add a lot of pool time quickly. The 2020 review specifically advises developing swimmers to avoid sudden, large increases in volume.
• Growth spurts. During puberty, bones lengthen faster than tendons and muscles can adapt, which changes joint mechanics temporarily. (More on this pattern in our growth spurt guide.)
• Underdeveloped scapular control. The small stabilizing muscles around the shoulder blade lag behind the larger pulling muscles, leading to imbalances.
• Stroke flaws under fatigue. Late-practice technique breakdown loads the shoulder in positions it was not built for.
• Specialization. Year-round swimming with no off-season has become the norm. There is no recovery window.

The takeaway is not to scare anyone away from competitive swimming. It is to take early signs seriously.

Early Warning Signs Worth Watching For

Most swimmer's shoulder cases do not start with sharp pain. They start with vague discomfort that swimmers learn to ignore. The signs to look for:

• A "weird" feeling in the front of the shoulder, especially after high-volume sets
• Discomfort during the recovery phase of freestyle (when the arm is overhead)
• A pinching or catching sensation at the top of the stroke
• Soreness that lingers more than 24 hours after a heavy practice
• Reduced range of motion when reaching overhead or behind the back
• Shoulder weakness on push-ups or pull-related dryland
• Sleep disruption from rolling onto that side

If any of these show up consistently for more than a week, that is the signal to act, not to push through.

Prevention That Actually Works

No single exercise prevents swimmer's shoulder, but a few habits come up again and again in the research and in clinical advice:

1. Dryland focused on shoulder-blade control and rotator cuff balance. Over a season, swimmers tend to develop an imbalance between the muscles that rotate the shoulder inward and outward. In a 2025 randomized trial, swimmers aged 16 to 35 who did a short strengthening program twice a week for 12 weeks (with bands or light weights) kept that balance better than a control group (Tavares et al., 2025). Common exercises include scapular Y's, T's and W's, band external and internal rotations, scapular push-ups and face pulls. Your club's coach or a physio should pick and teach them.

2. Technique work, not just yardage. Stroke flaws like a dropped elbow on the catch, crossing over the centerline, or aggressive thumb-first hand entry all increase shoulder load. A coach who actively corrects these issues is doing more for shoulder health than any stretch.

3. Rest days are training. The body adapts during recovery, not during work. The American Academy of Pediatrics' 2024 report on overuse injuries and burnout in young athletes stresses regular rest days and time away from the sport during the year (Brenner & Watson, 2024). Ask the coach how rest is built into the season.

4. Land-based mobility, not just stretching the shoulder. Tight hips and a stiff thoracic spine force the shoulder to compensate. Mobility work for the upper back and hips often does more for shoulder health than direct shoulder stretching.

5. Watch the volume jumps. A swimmer who doubles their practices mid-season takes on more load than one who builds gradually. Coaches and parents should agree on how fast volume goes up, especially after a move to a new group.

If your swimmer's club does not include dryland in the weekly schedule, that is worth a conversation with the coach.

When to See a Doctor

Shoulder pain that lingers, sharpens, or limits range of motion is not something to manage at home. The right call is a sports physician or sports physiotherapist who works with overhead athletes. Signs that a doctor visit is warranted:

• Pain that persists more than 7-10 days despite reduced training
• Pain that wakes the swimmer up at night
• Visible loss of range of motion compared to the other shoulder
• Weakness or "giving way" when lifting overhead
• Any sharp, sudden pain during a stroke or a fall

A physiotherapist can identify the specific problem (impingement, rotator cuff, labrum, biceps) and design a corrective program. Shoulder issues caught early are usually easier to manage than ones that have been pushed through for months.

The Parent's Role (And It Is Not "Tough It Out")

This is the hardest part for swim parents to get right. The competitive culture of swimming rewards toughness. Swimmers who complain are sometimes seen as soft. As a result, a 12-year-old with real shoulder pain often masks it for months because they do not want to be seen as weak or be pulled from the team.

Your job as a parent is to make it safe to say "my shoulder hurts." That looks like:

• Asking how the body feels after practice without making it a big production
• Believing them the first time, not the fifth
• Working with the coach, not around them, when something does not feel right
• Modeling that rest is part of training, not the opposite of it
• Never punishing or pressuring a swimmer for taking a day off due to pain

A swimmer who learns to listen to their body at 12 will still be swimming at 22. A swimmer who learns to ignore it often is not.

Shoulder trouble often shows up in the results before a swimmer admits it: times stall or slide during a heavy block. To see that trend, open Compare → Seasons in Gophin and put this season next to last in the same event and pool type. Free. It is not a diagnosis, but it is a useful picture to bring to the coach or physio.

For the rest of the season, see our guides on growth spurts and swim performance and how much sleep swimmers need.

Sources

1. Stirling, B.D. et al. (2024). Shoulder Pain in Competitive Swimmers: A Multi-Site Survey Study. International Journal of Sports Physical Therapy. pmc.ncbi.nlm.nih.gov
2. Feijen, S. et al. (2020). Swim-Training Volume and Shoulder Pain Across the Life Span of the Competitive Swimmer: A Systematic Review. Journal of Athletic Training. pmc.ncbi.nlm.nih.gov
3. Tessaro, M. et al. (2017). Shoulder Pain in Competitive Teenage Swimmers and Its Prevention: A Retrospective Epidemiological Cross Sectional Study of Prevalence. International Journal of Sports Physical Therapy. pmc.ncbi.nlm.nih.gov
4. Tavares, N. et al. (2025). Effect of Preventive Exercise Programs for Swimmer's Shoulder Injury on Rotator Cuff Torque and Balance in Competitive Swimmers: A Randomized Controlled Trial. Healthcare. pmc.ncbi.nlm.nih.gov
5. Tate, A. et al. (2012). Risk factors associated with shoulder pain and disability across the lifespan of competitive swimmers. Journal of Athletic Training. pubmed.ncbi.nlm.nih.gov
6. Tovin, B.J. (2006). Prevention and Treatment of Swimmer's Shoulder. North American Journal of Sports Physical Therapy. pmc.ncbi.nlm.nih.gov
7. Brenner, J.S. & Watson, A. (2024). Overuse Injuries, Overtraining, and Burnout in Young Athletes. Pediatrics, 153(2). doi.org/10.1542/peds.2023-065129