Your rotator cuff is a group of four shoulder muscles and tendons that help keep the ball of your upper arm centred in the shoulder socket while you lift, reach, rotate, and control your arm. If you are trying to make sense of shoulder pain, it helps to start with the broader shoulder pain picture and then compare it with common rotator cuff injury patterns.

In simple terms, the rotator cuff gives your shoulder both movement and stability. When it becomes irritated, weak, overloaded, or torn, everyday tasks such as dressing, reaching overhead, sleeping on that side, gym work, throwing, or lifting can become painful. Rotator cuff problems often overlap with conditions such as shoulder impingement, shoulder bursitis, and rotator cuff tendinopathy.

What muscles make up the rotator cuff?

The rotator cuff has four muscles: supraspinatus, infraspinatus, teres minor, and subscapularis. Their tendons blend around the top of the shoulder and help keep the head of the humerus steady against the shoulder blade as your arm moves.

• Supraspinatus helps start arm lifting.
• Infraspinatus helps rotate the arm outwards.
• Teres minor assists external rotation and control.
• Subscapularis helps rotate the arm inwards and stabilise the joint.

What does the rotator cuff do?

The rotator cuff helps control shoulder movement and stability during lifting, reaching, pushing, pulling, and throwing.

Common causes of rotator cuff problems

Rotator cuff problems can occur from sudden injury or gradually from repeated overhead use, gym overload, or age-related tendon changes.

What injuries affect the rotator cuff?

• Rotator cuff tendinopathy
• Shoulder impingement
• Shoulder bursitis
• Calcific tendinopathy
• Rotator cuff tear

How do you know if you have a rotator cuff injury?

Common symptoms include pain when lifting the arm, weakness, night pain, and reduced function.

How is a rotator cuff injury treated?

Physiotherapy is often the first approach. Treatment includes load management, strengthening, and movement correction.

Can a rotator cuff tear heal without surgery?

Many cases improve without surgery, although larger tears may need medical review.

Frequently asked questions

Is the rotator cuff a muscle or a tendon?

It includes both muscles and tendons working together.

Can you still move your arm with a rotator cuff tear?

Yes, depending on severity. Smaller tears often still allow movement.

Does rotator cuff pain always mean surgery?

No. Many cases respond well to physiotherapy.

When should you get it checked?

If pain persists, worsens, or limits function, seek assessment.

What to do next

Compare your symptoms with rotator cuff injury and shoulder pain pages, or book a physiotherapy assessment.

References

1. Rotator Cuff Anatomy – NCBI
2. Rotator cuff tendinopathy clinical guideline
3. Shoulder examination systematic review