Swimming is one of the most popular summer activities on the Northern Beaches. It feels low impact, refreshing and easy on the body. For many people, it seems like the perfect way to stay active without the joint stress of running or heavy gym work.
But every summer we see the same pattern in clinic. People increase their swimming and suddenly their shoulder starts to ache. It might begin as a dull soreness after a swim and slowly turn into pain that lingers during daily tasks or even at rest.
So why does something that feels so easy end up causing shoulder pain?
Swimming Is Low Impact But High Load
Swimming might not involve impact with the ground, but it places a large repetitive load through the shoulder.
Every stroke asks your shoulder to move through a big range while producing force. Over a single swim session this can add up to thousands of repetitions. When swimming volume increases quickly, the shoulder tissues often struggle to keep up.
This is especially common when people return to swimming after a break or use swimming to replace other forms of exercise over summer.
Why Shoulder Pain Shows Up In Summer
A Sudden Increase In Volume
Many people go from little or no swimming to multiple ocean or pool sessions each week. Tendons and muscles respond best to gradual loading, not big spikes.
Strength Gaps
Swimming relies heavily on the rotator cuff, upper back and trunk for shoulder control. If these areas are under prepared, the shoulder joint absorbs more stress.
Fatigue Changes Movement
As the shoulder muscles tire, technique often changes. This can increase strain through the front or top of the shoulder without you realising.
Repetitive Overhead Position
The overhead arm position used in freestyle and butterfly places the shoulder in a vulnerable position if control and strength are lacking.
Common Signs Swimming Is Irritating Your Shoulder
- Ache at the front or top of the shoulder after swimming
- Pain when reaching overhead or behind your back
- Shoulder stiffness the day after a swim
- Loss of power or early fatigue during sessions
Pain rarely appears suddenly. It usually builds over weeks as load exceeds capacity.
Why Rest Alone Is Not The Answer
Stopping swimming completely might settle symptoms in the short term, but it rarely solves the underlying issue.
Shoulders need strength, control and gradual exposure to load. Without addressing these factors, pain often returns once swimming resumes.
The goal is not to avoid swimming, but to help your shoulder tolerate it better.
How To Keep Swimming Without Shoulder Pain
If your shoulder is starting to ache, the answer is rarely to stop swimming altogether. In most cases, the shoulder just needs better support and smarter loading so it can tolerate what you are asking of it.
Adjust Load Before You Stop Completely
The first step is usually reducing volume, not removing swimming entirely. This might mean fewer laps, shorter swims, or spacing sessions out across the week.
Complete rest often leads to deconditioning, which can make the shoulder more sensitive when you return. Keeping some exposure, at a level the shoulder tolerates, helps maintain confidence and capacity.
Build Strength Where Swimming Demands It
Swimming places a lot of repetitive demand on the rotator cuff and upper back muscles. These muscles help centre the shoulder joint and control the arm through long ranges of motion.
If they fatigue too quickly, load shifts into the joint and tendons instead. Targeted strength work helps the shoulder share the load more evenly and cope with longer swims.
This type of strength work is often missing from general gym programs, even in people who feel otherwise fit.
Improve Control Rather Than Just Stretching
When shoulders feel sore or tight, people often default to stretching. While mobility has a place, shoulder pain is more commonly linked to poor control rather than stiffness.
Improving how the shoulder moves through range, especially overhead, allows you to swim with less irritation and less compensatory tension.
Respect Fatigue
Technique tends to change when the shoulder gets tired. This is often when pain begins, even if the first part of the swim feels fine.
Stopping before form breaks down is one of the simplest ways to reduce flare ups while still maintaining fitness.
Progress Gradually
Swimming volume should build the same way running or gym loads do. Tendons and muscles adapt best when progression is steady and predictable.
Adding distance, intensity and frequency all at once is one of the fastest ways to irritate a shoulder that otherwise feels strong.
Get A Shoulder Specific Assessment
Every swimmer’s shoulder story is slightly different. Past injuries, posture, training history and swimming style all play a role.
A physiotherapist can assess how your shoulder moves, how it handles load and where strength or control is lacking. From there, rehab becomes targeted rather than guesswork.
The Takeaway
Swimming is great for fitness, recovery and mental health. But it is still a demanding activity for the shoulder.
If your shoulder hurts when swimming ramps up, it does not mean swimming is bad for you. It usually means your shoulder needs better preparation and smarter load management.
With the right balance of strength, control and progressive loading, most people can return to pain free swimming and enjoy the water all summer.
If shoulder pain is stopping you from swimming comfortably, our team at Swell Physio and Performance can help you build capacity, restore movement confidence and keep you moving well.
