Swimmer's shoulder: why triathletes on the Costa del Sol get shoulder pain and how physiotherapy fixes it

By Flora | Physio Flora — Physiotherapist & Sports Performance Specialist, Riviera del Sol & Marbella, Costa del Sol

Reading time: approx. 7 minutes

It starts as a dull ache after your swim set, easy to ignore at first. Then it creeps into your bike pull and your push up at the gym. Soon it is there every time you reach overhead, and race day is getting closer.

This is swimmer's shoulder, and it is one of the most common injuries we treat in triathletes and open water swimmers along the coast. The good news is that it responds very well to the right physiotherapy approach, and most athletes return to full training without needing surgery.

Freestyle swimming

In this guide, you'll find:

• The most common causes of swimmer's shoulder in triathletes

• How we diagnose the root cause at Physio Flora

• Our physiotherapy treatment options for shoulder impingement

• Three physiotherapist-approved exercises to start today

• Answers to the questions our patients ask most
  

What is swimmer's shoulder

Swimmer's shoulder is an umbrella term for rotator cuff irritation and shoulder impingement caused by repetitive overhead movement. In addition, it often involves the biceps tendon and the small stabilising muscles around the shoulder blade.

Triathletes are particularly prone to this injury. This is because swimming demands thousands of overhead rotations each week, and this volume is then added to cycling and running training. As a result, the shoulder rarely gets a true chance to recover.

The Costa del Sol is one of Europe's most popular triathlon training bases. Warm water, calm bays around Marbella and Fuengirola, and a long outdoor season mean many athletes swim year round. However, this same advantage is exactly why we see so many overuse shoulder injuries in our clinics.

Common causes of shoulder pain in swimmers and triathletes

Several factors combine to cause this injury, and most patients have more than one at play.

Training load errors. A sudden jump in swim volume, too many sessions with paddles, or a new focus on sprint speed can overload the shoulder before it has adapted. Because of this, we always ask about recent changes to training plans.

Poor stroke technique. A dropped elbow on the catch phase, over rotation, or crossing the midline during recovery all increase strain on the rotator cuff. Therefore, technique review is a core part of our assessment.

Weak scapular stabilisers. The muscles that control the shoulder blade need to work in sync with the rotator cuff. If they are weak or fatigued, the ball of the shoulder joint sits slightly off centre. This narrows the space where the rotator cuff tendons pass, and impingement follows.

Reduced thoracic mobility. A stiff upper back limits how far the arm can rotate overhead without compensating at the shoulder joint. In contrast, athletes with good thoracic rotation tend to load their shoulders more evenly.

Previous injury left undertreated. Many triathletes push through early shoulder niggles because they do not want to lose fitness before a race. Unfortunately, this often turns a mild irritation into a more stubborn, chronic problem.

How we diagnose swimmer's shoulder at Physio Flora

An accurate diagnosis is essential, because shoulder pain can come from several different structures. During your assessment, we look at the full picture rather than just the painful spot.

We start with a detailed history, including your training volume, stroke style, and any bike or gym work that loads the shoulder. We then assess shoulder range of motion, scapular control, and rotator cuff strength using manual testing.

We also screen your thoracic spine and neck, since stiffness here is a common hidden contributor. As a McKenzie-trained therapist, I pay close attention to how your symptoms behave with repeated movement, since this often reveals the true source of pain.

Where needed, we combine this with Mulligan manual therapy techniques to test whether a joint mobilisation immediately improves your pain free range. This gives us, and you, fast and clear feedback on the right treatment direction.

Physiotherapy treatment options for shoulder impingement

Treatment is always tailored to what we find in your assessment, however most swimmer's shoulder programmes include a combination of the following.

Manual therapy and joint mobilisation. Hands on techniques restore normal joint mechanics in the shoulder and thoracic spine. This reduces pain quickly and improves the quality of your movement.

Dry needling. This targets tight, overactive muscles such as the upper trapezius and pec minor. As a result, it can relieve referred pain and restore more normal muscle activation patterns around the shoulder blade.

Shockwave therapy. For more persistent tendon irritation, shockwave therapy stimulates healing in the rotator cuff and biceps tendon. Many athletes notice reduced pain within a few sessions.

Progressive strength rehabilitation. We rebuild rotator cuff and scapular strength through a structured programme. This starts with isometric holds and progresses to sport specific loading, matched to your race calendar.

Stroke and load management advice. We work with your coach or training plan where possible. In addition, we give clear, practical guidance on how to adjust swim, bike, and gym sessions while you recover, so you keep training instead of stopping completely.

Perfect symmetrical butterfly stroke.

Three physiotherapist-approved exercises to start today

These exercises are a starting point for mild symptoms. However, always check with a physiotherapist before progressing if you have significant pain.

1. Scapular wall slides. Stand with your back against a wall, arms in a W position with elbows and wrists touching the wall. Slowly slide your arms upward into a Y shape, keeping contact with the wall. Perform 2 sets of 10, focusing on smooth, controlled movement.

2. Side lying external rotation. Lie on your side with your top elbow bent at 90 degrees and tucked into your ribs. Holding a light dumbbell, rotate your forearm upward, then lower slowly. Perform 3 sets of 12 on each side.

3. Prone Y raises. Lie face down on a bench or bed with your arms hanging in a Y position. Lift your arms slightly, squeezing your shoulder blades together, then lower with control. Perform 2 sets of 10, keeping the movement small and controlled.

Frequently asked questions

Can I keep swimming with swimmer's shoulder? Often yes, but your sessions may need modifying. For example, reducing paddle use, shortening sets, or adjusting stroke focus can allow training to continue while you recover.

How long does swimmer's shoulder take to heal? Mild cases often improve within two to four weeks of targeted treatment. More persistent cases, especially if ignored for months, can take eight to twelve weeks of consistent rehabilitation.

Do I need a scan before starting physiotherapy? Not always. In many cases, a thorough clinical assessment gives us enough information to start effective treatment straight away. However, we will refer for imaging if your presentation suggests a more significant tear.

Is this the same as a rotator cuff tear? Not necessarily. Swimmer's shoulder usually describes irritation and impingement rather than a structural tear. However, a proper assessment is important to rule this out, particularly if strength is significantly reduced.

Shoulder pain does not have to end your triathlon season.

At Physio Flora, we combine thorough clinical assessment with evidence-based treatment and a genuine understanding of the active, outdoor lifestyle that brings people to, and keeps people on, the Costa del Sol. With 15 years of experience treating Olympic and Ironman athletes, we know exactly what it takes to get you back to training safely. We see patients from Riviera del Sol, Marbella, Fuengirola, Estepona, Benalmádena, Mijas, Calahonda, Elviria, and Benahavís, with home visits available on request.

No referral needed. Consultations in English, Dutch, German and Spanish. Same week appointments available.

Website: www.physioflora.es Phone: +34 711 059 592 Email: hello@physioflora.es Clinic locations: 📍Riviera del Sol (Urb Balcon del Golf, c/ Topacio 2, local 1-2, 29649, Riviera del Sol, Mijas) 📍Marbella (inside: The Clubhouse Marbella, c/ Juan Belmonte, Nueva Andalusia)

Your shoulders carry you through every stroke, every ride, and every step. Give them the expert care they deserve.

Physio Flora · English, Dutch, German and Spanish-speaking physiotherapy on the Costa del Sol · Specialising in triathlon and endurance sports injuries