Shoulder Pain 101: Why It Happens and What Can Help

Does your shoulder feel tight, sore, or restricted when you lift your arm, reach overhead, or even lie on your side?

Shoulder pain often develops gradually. It may start as a mild ache with certain movements, then become more noticeable with everyday tasks like reaching into a cupboard, putting on a shirt, or exercising. In some cases, it can even disturb sleep.

The shoulder is one of the most mobile joints in the body, but that mobility comes at a cost. It relies heavily on muscle control and positioning rather than deep structural stability. When that control is disrupted, pain can develop.

So what is actually causing the pain?

Most shoulder pain is related to how the ball of the shoulder joint moves within the shallow socket of the shoulder blade.

Unlike the hip, which has a deep, stable socket, the shoulder is designed for movement. The ball must stay centred within a relatively small space as the arm moves. When that space becomes reduced or the ball shifts slightly out of position, surrounding structures can become irritated.

This is often referred to as a loss of subacromial space, and it can lead to compression of the rotator cuff tendons or the bursa, which are both sensitive to irritation.

Why does posture play such a big role?

Posture has a direct impact on shoulder positioning. When the shoulders sit forward, which is common with prolonged sitting or desk work, the position of the shoulder blade changes. This can pull the ball of the shoulder slightly forward and upward, reducing the available space in the joint.

Over time, this can increase strain on the rotator cuff and surrounding tissues, making movements like lifting the arm or reaching overhead more uncomfortable.

How does the upper back affect the shoulder?

The shoulder does not work in isolation. It relies on the upper back, or thoracic spine, to move well.

If the mid-back is stiff, the shoulder often compensates by moving more than it should. This extra movement can shift the position of the ball in the socket and increase stress on the tissues that stabilise the joint.

This is why improving thoracic mobility is often an important part of shoulder rehabilitation.

What about muscle strength and control?

The shoulder depends on a group of muscles to keep it stable during movement. These include the rotator cuff and the muscles that control the shoulder blade.

If the shoulder blade muscles are weak or not working effectively, the socket can rotate downward or move in a way that reduces support for the joint. This increases reliance on the smaller rotator cuff muscles and can lead to irritation over time.

In simple terms, the shoulder becomes less supported and more vulnerable to overload.

Why do overhead movements aggravate symptoms?

Activities that involve lifting the arm overhead place higher demands on the shoulder.
When the arm is raised, the space within the shoulder naturally becomes smaller. If the joint is already poorly positioned or the muscles are not controlling movement well, this can lead to increased pressure on the rotator cuff tendons and the bursa.

Over time, repeated overhead activity, such as swimming, gym training, or lifting, can contribute to irritation and pain.

What conditions can this lead to?

These movement and positioning issues can contribute to a range of common shoulder problems, including rotator cuff tendon irritation (often called tendonitis), subacromial bursitis, shoulder impingement, and shoulder instability. While these conditions have different names, they often share similar underlying factors related to movement control and joint positioning.

How can tape help?

Taping can be a useful tool in managing shoulder pain, particularly when posture and movement control are contributing factors.

By supporting the shoulder in a more optimal position, tape can help reduce the forward shift of the joint and improve alignment between the ball and socket. This can increase the available space within the joint and reduce pressure on sensitive tissues.

Taping can also encourage better activation of the muscles that stabilise the shoulder blade and upper back, helping the joint feel more supported during movement. For many people, this leads to a noticeable reduction in pain and an improvement in how the shoulder moves.

What else can help?

Most shoulder pain improves with the right combination of mobility, strength, and movement retraining.

A physiotherapist can help by:

• assessing posture and shoulder positioning
  
• improving thoracic spine mobility
  
• strengthening the rotator cuff and shoulder blade muscles
  
• retraining movement patterns for lifting and reaching
  
• showing you how to use tape to support the shoulder during recovery

The goal is to improve how the shoulder functions, not just reduce symptoms.

How long does it take to improve?

Recovery depends on how long the problem has been present and how well the contributing factors can be addressed.

A useful indicator is how your shoulder feels when it is supported. If movement becomes easier and less painful with taping, it suggests that improving alignment and muscle control is likely to be an effective approach. Over time, as strength and movement improve, the need for support should reduce.

Watch the video

To learn more about the common causes of shoulder pain, watch our Causes of Pain explainer video.

Final takeaway
Shoulder pain is often the result of changes in posture, movement, and muscle control that reduce space within the joint and place stress on sensitive tissues.

With the right support and a targeted rehabilitation approach, most people can improve significantly and return to normal activity.

At McConnell Therapeutics, our Rigid Tape and Under Tape are designed to help support better shoulder positioning and reduce pain while you work on the underlying cause. For those with sensitive skin, Under Tape Sensitive has a silicone-based adhesive which is well suited for use on the shoulder.

Always speak with a physiotherapist before starting any new treatment. This blog is for educational purposes only and does not replace professional medical advice.

References

McConnell, J., & McIntosh, B. (2009). The effect of tape on glenohumeral rotation range of motion in elite junior tennis players. Clin J Sport Med, 19(2), 90–94.
McConnell, J., Donnelly, C., Hamner, S., Dunne, J., & Besier, T. (2011). Effect of shoulder taping on maximum shoulder external and internal rotation range in uninjured and previously injured overhead athletes during a seated throw. J Orthop Res, 29(9), 1406–1411.
McConnell, J., Donnelly, C., Hamner, S., Dunne, J., & Besier, T. (2012). Passive and dynamic shoulder rotation range in uninjured and previously injured overhead throwing athletes and the effect of shoulder taping. PMR, 4(2), 111–116.