What Is a Rotator Cuff Injury? A Plain-Language Guide to the Shoulder Problem That Aches Deep and Keeps You Up at Night

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026

Quick Answer

A rotator cuff injury is damage to the muscles and tendons that hold the upper arm bone in the shoulder socket, ranging from inflammation to complete tears. [1] It causes a deep shoulder ache that worsens at night, usually from gradual wear and tear or overhead activity. [1] Rest, therapy and injections often help, while severe tears may need surgery. [2]

What the research says

• For many people, surgery gives little extra pain relief over non-surgical care after one year. A Cochrane review of 9 randomized trials with 1,007 adults found that, in 3 trials with 258 participants, repair surgery probably provides little or no improvement in pain at one year compared with non-operative treatment (0.87 points better on a 0-to-10 scale; 95% CI 0.43 to 1.30). The trials mostly involved small degenerative tears, so the findings may not apply to sudden traumatic tears. (Karjalainen et al., Cochrane Database Syst Rev, 2019) [5]

• Rotator cuff tears are common, and many people have them without symptoms. A meta-analysis of 17 studies with 5,988 participants found a pooled prevalence of 38.6%, ranging from 23.6% in asymptomatic or never-presented populations to 55.5% in symptomatic, trauma, or outpatient populations; full-thickness tears were less common (21.0%) than any tear (43.8%). (Yang et al., Front Physiol, 2026) [6]

• Steroid injections help little beyond short-term relief. In a meta-analysis of 15 randomized trials with 1,785 participants with rotator cuff tendinopathy, adding a corticosteroid injection to physical therapy might give small to moderate short-term improvements in pain and function, but injection alone seemed no more effective than physical therapy, and at mid- and long-term follow-up injections seemed no more effective than any physical therapy approach. The certainty of the evidence was moderate to mostly very low. (Lazzarini et al., Phys Ther, 2025) [7]

What Is the Rotator Cuff, and How Does It Get Injured?

The rotator cuff is a group of muscles and tendons that surround the shoulder joint. These muscles keep the ball of the upper arm bone firmly within the shallow socket of the shoulder. [1] When part of the rotator cuff becomes irritated or damaged, it can result in pain, weakness, and reduced range of motion.

Rotator cuff injuries can range from simple inflammation to complete tendon tears. [1] Sometimes a tear happens out of nowhere from a single injury, such as a fall. In those cases, it's wise to seek medical advice quickly, because surgery might be needed. [1]

The rotator cuff keeps the shoulder ball seated in its shallow socket — and injuries happen when its tendons wear down or tear.

What Does a Rotator Cuff Injury Feel Like?

The pain of a rotator cuff injury can show up in several ways:

Sign	What it looks like
Dull ache	Described as a dull ache deep in the shoulder [1]
Trouble sleeping	The pain can disturb sleep [1]
Hard-to-do moves	Difficulty combing your hair or reaching behind your back [1]
Arm weakness	The pain may be accompanied by weakness in the arm [1]

Notably, some rotator cuff injuries don't cause pain at all. [1] [3]

What Causes a Rotator Cuff Injury?

Rotator cuff injuries are most often caused by progressive wear and tear of the tendon tissue over time. [1] [3] Repetitive overhead activity or prolonged bouts of heavy lifting can irritate or damage the tendon. [1] The rotator cuff can also be injured in a single incident during falls or accidents. [1] [3]

Who Is Most at Risk of a Rotator Cuff Injury?

Rotator cuff injuries are common and increase with age. [1] Several factors can raise the risk:

Risk factor	Why it matters
Age	The risk increases with age. Rotator cuff tears are most common in people older than 50. [1]
Some occupations	Jobs requiring repetitive overhead arm motions — such as carpentry or house painting — can damage the rotator cuff over time. [1] [3]
Certain sports	Some injuries are more common in people who play baseball or tennis or lift weights. [1] [4]
Family history	There may be a genetic component, as these injuries appear to occur more commonly in certain families. [1]

What Happens If a Rotator Cuff Injury Goes Untreated?

Without treatment, rotator cuff problems may lead to permanent loss of motion or weakness of the shoulder joint. [1]

When Should You See a Doctor Right Away?

Your family healthcare professional can evaluate short-term shoulder pain. See your care team right away if you have immediate weakness in your arm after an injury. [1]

Situation	What to do
Short-term shoulder pain	Your family healthcare professional can evaluate it.
Immediate arm weakness after an injury	See your care team right away — a sudden tear might need surgery.

How Is a Rotator Cuff Injury Diagnosed?

A physical exam is the first step. During the exam, a healthcare professional will press on different parts of the affected shoulder and move the arm into different positions. They'll also test the strength of the muscles around the shoulder and in the arms. [2]

Imaging tests may also help:

Imaging test	What it shows
X-rays	A rotator cuff tear won't show up on an X-ray, but this test can visualize bone spurs or other potential causes for your pain, such as arthritis. [2] [3]
Ultrasound	Uses sound waves to produce images of structures within your body, particularly soft tissues such as muscles and tendons. It lets a provider assess the shoulder's structures during movement and quickly compare the affected shoulder with the healthy one. [2]
MRI (magnetic resonance imaging)	Uses radio waves and a strong magnet. The images display all structures of the shoulder in great detail. [2]

Diagnosis starts with a hands-on exam, then imaging — with MRI giving the most complete picture of the torn tendon.

How Is a Rotator Cuff Injury Treated?

Conservative treatments — such as rest, ice, and physical therapy — sometimes are all that's needed to recover from a rotator cuff injury. [2] If the injury is severe, you might need surgery. [2]

What Does Physical Therapy Involve?

Physical therapy is usually one of the first treatments suggested. [2] Exercises tailored to the specific location of your rotator cuff injury can help restore flexibility and strength to your shoulder. [2] Physical therapy is also an important part of the recovery process after rotator cuff surgery. [2]

What About Injections?

An injection into the shoulder joint might be helpful — especially if the pain is interfering with sleep, daily activities, or physical therapy. [2] While such shots often provide temporary relief, they also can weaken the tendon and reduce the success of future shoulder surgery. [2]

When Is Surgery Needed, and What Types Are There?

Many different types of surgery are available for rotator cuff injuries:

Surgery type	How it works
Arthroscopic tendon repair	Surgeons insert a tiny camera (arthroscope) and tools through small incisions. The tools reattach the torn tendon to the bone. [2]
Open tendon repair	The surgeon works through a larger incision to reattach the damaged tendon to the bone; this may be a better option in some situations. [2]
Tendon transfer	If the torn tendon is too damaged to be reattached to the arm bone, a nearby tendon is used as a replacement. [2] The tendon most commonly transferred is the latissimus dorsi tendon in the back.
Shoulder replacement	Massive rotator cuff injuries may require shoulder replacement surgery. [2] A reverse shoulder arthroplasty installs the ball of the artificial joint onto the shoulder blade and the socket onto the arm bone, which can improve stability [2] — especially if arthritis affects the joint.

Most rotator cuff injuries start with conservative care; four surgical options exist for severe tears — repair, open repair, tendon transfer, and shoulder replacement.

What Can You Do at Home to Ease the Pain?

The pain from a minor rotator cuff injury often diminishes on its own, with proper care. [2] Here's what helps:

Self-care step	Details
Stop the painful activity	Stop doing what caused the pain and try to avoid painful movements. [2]
Limit heavy loads and overhead work	Limit heavy lifting or overhead activity until the shoulder pain subsides. [2]
Ice the shoulder	Icing the shoulder may help it feel better. [2]
Over-the-counter pain relievers	Ibuprofen (Advil, Motrin IB, others) or acetaminophen (Tylenol, others) may be helpful. [2]

How Should You Prepare for Your Appointment?

You'll probably start by seeing your family healthcare professional or sports medicine physician. If your injury is severe, you might be referred to an orthopedic surgeon. [2] If you've been treated for a similar problem in the past, bring past records and imaging studies to your appointment. [2]

What Should You Write Down Beforehand?

Before the appointment, you might want to write a list that answers these questions:

Question to consider	Why it helps
When did you first begin experiencing shoulder pain?	Establishes the timeline
What movements and activities worsen your shoulder pain?	Identifies the aggravating patterns
Have you ever injured your shoulder?	Reveals possible past trauma
Have you experienced any symptoms in addition to shoulder pain?	Captures the full picture (weakness, sleep disturbance)
Does the pain travel down your arm below your elbow?	Helps distinguish shoulder pain from nerve-related pain
Is the shoulder pain associated with any neck pain?	Helps rule out neck-related causes
Does your job or hobby aggravate your shoulder pain?	Connects activity to symptoms

What Will Your Doctor Ask?

Being ready to answer may reserve time to go over points you want to spend more time on. Your doctor may ask where exactly the pain is located, how severe your pain is, what movements and activities aggravate or relieve your shoulder pain, and whether you have any weakness or numbness in your arm.

Doctor's question	What it reveals
Where exactly is the pain located?	Pinpoints the affected area
How severe is your pain?	Gauges the impact on daily life
What movements and activities aggravate or relieve your shoulder pain?	Maps triggers and relief patterns
Do you have any weakness or numbness in your arm?	Checks for nerve involvement and significant tendon damage

The Bottom Line

A rotator cuff injury is one of the most common shoulder problems — and its pattern is distinctive: a dull ache deep in the shoulder that worsens at night, makes combing your hair or reaching behind your back a struggle, and sometimes brings arm weakness. Most injuries build up slowly through wear and tear, especially in people over 50, overhead workers like carpenters and painters, and athletes in baseball, tennis, and weightlifting, though a single fall or accident can cause a sudden tear. Because untreated problems can lead to permanent loss of motion or strength, it's worth taking the injury seriously. The good news is that conservative care — rest, ice, activity changes, physical therapy, and sometimes injections — gets many people through without an operation, and four well-established surgical options exist when a tear is severe. The one moment that calls for immediate attention is immediate arm weakness right after an injury.

Take the Next Step

If your shoulder aches deep and disturbs your sleep, don't shrug it off as "getting older." Start by easing the load — stop the activity that caused the pain, limit heavy lifting and overhead work, ice the shoulder, and ask your healthcare professional whether an over-the-counter pain reliever like ibuprofen or acetaminophen is right for you. See your family healthcare professional about short-term shoulder pain, and get evaluated right away if you develop immediate arm weakness after an injury. If symptoms persist, ask whether physical therapy, imaging, or an injection might be part of your plan — early care protects your shoulder's long-term motion and strength.

Frequently Asked Questions

What is a rotator cuff injury?

An injury to the group of muscles and tendons that surround the shoulder joint and keep the ball of the upper arm bone firmly within the shallow shoulder socket. Injuries range from simple inflammation to complete tendon tears.

What does a rotator cuff injury feel like?

The pain is usually described as a dull ache deep in the shoulder. It can disturb sleep, make it difficult to comb your hair or reach behind your back, and be accompanied by arm weakness. Some rotator cuff injuries don't cause pain.

What causes it?

Most often, progressive wear and tear of the tendon tissue over time. Repetitive overhead activity or prolonged bouts of heavy lifting can irritate or damage the tendon. A single fall or accident can also injure the rotator cuff.

Who is most at risk?

The risk increases with age, and tears are most common in people older than 50. Jobs with repetitive overhead arm motions (carpentry, house painting), sports such as baseball, tennis, and weightlifting, and family history also raise the risk — there may be a genetic component.

Can it heal on its own?

The pain from a minor rotator cuff injury often diminishes on its own with proper care — stopping the painful activity, avoiding painful movements, limiting heavy lifting and overhead activity, icing the shoulder, and using over-the-counter pain relievers such as ibuprofen or acetaminophen.

Is surgery always needed?

No. Conservative treatments such as rest, ice, and physical therapy sometimes are all that's needed to recover. Surgery is considered for severe injuries and includes arthroscopic tendon repair, open tendon repair, tendon transfer, and shoulder replacement (including reverse shoulder arthroplasty).

What does a shoulder injection do?

An injection into the shoulder joint might be helpful, especially if pain is interfering with sleep, daily activities, or physical therapy. The relief is often temporary, and such shots can weaken the tendon and reduce the success of future shoulder surgery.

What happens if it goes untreated?

Without treatment, rotator cuff problems may lead to permanent loss of motion or weakness of the shoulder joint.

When should I see a doctor right away?

See your care team right away if you have immediate weakness in your arm after an injury. Your family healthcare professional can evaluate short-term shoulder pain.

How is it diagnosed?

A physical exam comes first — the provider presses on different parts of the affected shoulder, moves the arm into different positions, and tests muscle strength. Imaging may include X-rays (to look for bone spurs or arthritis), ultrasound (to view soft tissues during movement and compare both shoulders), and MRI (which displays all shoulder structures in great detail).

Related Reading

• Frozen Shoulder (Adhesive Capsulitis): Symptoms, Causes & Treatment — Complete Guide

Neer's Test: How It Checks for Shoulder Impingement, Steps and What Results Mean explains the quick in-office shoulder exam providers use to check for shoulder impingement.

References

1. Mayo Clinic Staff. Rotator cuff injury: Symptoms and causes. Mayo Clinic. Last updated May 22, 2025. Accessed October 14, 2026. https://www.mayoclinic.org/diseases-conditions/rotator-cuff-injury/symptoms-causes/syc-20350225

2. Mayo Clinic Staff. Rotator cuff injury: Diagnosis and treatment. Mayo Clinic. Last updated May 22, 2025. Accessed October 14, 2026. https://www.mayoclinic.org/diseases-conditions/rotator-cuff-injury/diagnosis-treatment/drc-20350231

3. Aibinder WR. Rotator cuff tears. OrthoInfo, American Academy of Orthopaedic Surgeons. Accessed October 14, 2026. https://www.orthoinfo.org/diseases--conditions/rotator-cuff-tears/

4. Liebert PL. Rotator cuff injury/subacromial bursitis. Merck Manual Professional Version. Last updated November 2025. Accessed October 14, 2026. https://www.merckmanuals.com/professional/injuries-poisoning/sports-injury/rotator-cuff-injury-subacromial-bursitis

5. Karjalainen TV, Jain NB, Heikkinen J, et al. Surgery for rotator cuff tears. Cochrane Database Syst Rev. 2019;12(12):CD013502. PMID: 31813166. https://doi.org/10.1002/14651858.CD013502

6. Yang Y, Fu X, Meng S, Zhong M. Prevalence of rotator cuff tears: a systematic review and meta-analysis of observational studies. Front Physiol. 2026;17:1876217. PMID: 42755726. https://doi.org/10.3389/fphys.2026.1876217

7. Lazzarini SG, Buraschi R, Pollet J, et al. Effectiveness of additional or standalone corticosteroid injections compared to physical therapist interventions in rotator cuff tendinopathy: a systematic review and meta-analysis of randomized controlled trials. Phys Ther. 2025;105(3):pzaf006. PMID: 39836429. https://doi.org/10.1093/ptj/pzaf006

Disclaimer: This guide is for general information only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a physician or other qualified health provider with any questions about a medical condition. Never disregard professional medical advice or delay seeking it because of something you have read here.