Shoulder Pain
Causes, conditions, and how physical therapy helps
What causes shoulder pain?
The shoulder is the body's most mobile joint, which makes it powerful but also reliant on the surrounding muscles and tendons for stability. Pain appears when the demand on those tissues outpaces what they can handle. Causes generally fall into a few groups.
Tendon and overuse causes
The most common source is the rotator cuff — four muscles and tendons that lift and steady the arm. Overuse, repetitive overhead activity, or a sudden increase in load can irritate these tendons (tendinopathy) or the cushioning bursa (bursitis), producing pain with reaching and lifting.
Stiffness and joint causes
The joint capsule can tighten and become painful and stiff (frozen shoulder), severely limiting motion. Arthritis and the small AC joint on top of the shoulder can also cause pain.
Injury and instability causes
A fall, dislocation, or forceful movement can tear a tendon or the labrum (the rim of cartilage that deepens the socket) or leave the shoulder feeling loose and prone to "popping out."
Common shoulder conditions
Rotator cuff tendinopathy and tears, frozen shoulder, impingement, bursitis, labral tears, AC joint sprains, and instability are the conditions we see most. Each has its own detailed guide.
Common shoulder symptoms
Pain lifting the arm overhead, pain at night, trouble reaching behind the back, clicking or catching, and weakness with lifting are some of the most common patterns. How and when your shoulder hurts often hints at the cause — which is why a focused exam usually beats rushing to an MRI.
How physical therapy treats shoulder pain
A physical therapist examines how your shoulder blade, rotator cuff, and joint move together, finds which tissues are overloaded or stiff, and builds a graded plan. Treatment commonly blends targeted strengthening (especially the rotator cuff and shoulder blade muscles), mobility work, movement retraining, and short-term pain strategies. For most shoulder problems, exercise-based PT is a first-line, guideline-supported treatment.
Red flags — when to seek urgent care
Call emergency services for shoulder or left-arm pain with chest pressure, shortness of breath, sweating, or nausea (possible heart attack). Seek prompt care for a shoulder that looks deformed or can't move after an injury, a hot and swollen joint with fever (possible infection), or sudden major weakness.
Guides
AC Joint Pain (Sprain / Separated Shoulder): Symptoms, Causes & PT Treatment
The AC (acromioclavicular) joint sits right on top of your shoulder where the collarbone meets the shoulder blade. A sprain — often called a "separated shoulder" — usually follows a fall onto the shoulder and causes pinpoint pain on top, worse when reaching across your body. Most low-grade sprains heal well with physical therapy; higher-grade or deformed injuries need medical evaluation.
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Can't Reach Behind Your Back? Here's What It Means and What to Do
Difficulty reaching behind your back — to tuck in a shirt, hook a bra, or grab a wallet — usually signals lost shoulder rotation, most often from frozen shoulder or rotator cuff irritation. It's rarely an emergency, but frozen shoulder in particular benefits from early, well-dosed physical therapy. If the stiffness is progressing or pain is significant, get it assessed sooner rather than later.
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Clicking or Popping in the Shoulder? Here's What It Means and What to Do
Painless clicking or popping in the shoulder is usually harmless — it often comes from tendons or soft tissue gliding over bone and doesn't signal damage. Clicking that comes with pain, catching, weakness, or a feeling of instability is more meaningful and may involve the labrum or rotator cuff. If noise is paired with those symptoms, it's worth a physical therapy assessment.
1 min read
Do I Need Physical Therapy for Shoulder Pain?
Consider physical therapy if your shoulder pain has lasted more than 1–2 weeks, limits reaching, lifting, or sleep, or keeps coming back. See a doctor first for red flags like chest pressure with the pain, a deformed shoulder after a fall, or a hot, feverish joint. In most U.S. states you can see a PT directly without a referral.
1 min read
Dull Ache in the Shoulder and Upper Arm? Here's What It Means and What to Do
A dull ache spreading from the shoulder into the upper arm is classic for rotator cuff irritation — the cuff refers pain down the outer arm. It's usually an overuse problem and not serious. Modifying aggravating activity and strengthening the cuff and shoulder blade typically help. Important exception: shoulder or left-arm aching with chest pressure, breathlessness, or sweating can be a heart warning — treat that as an emergency.
1 min read
Frozen Shoulder (Adhesive Capsulitis): Symptoms, Causes & PT Treatment
Frozen shoulder is when the joint capsule tightens and inflames, causing pain and a major loss of motion in every direction — you may struggle to reach overhead, behind your back, or out to the side. It typically moves through painful "freezing," stiff "frozen," and "thawing" stages over many months. It usually recovers, and physical therapy helps manage pain and restore motion along the way.
1 min read
Rotator Cuff Injury (Tendinopathy): Symptoms, Causes & PT Treatment
A rotator cuff injury (tendinopathy) is irritation or overload of the tendons that lift and steady your arm — the most common cause of shoulder pain. It typically hurts with overhead reaching and lifting, and often aches at night. It's rarely an emergency and responds very well to physical therapy, especially progressive strengthening. Most people improve within 6–12 weeks without surgery.
1 min read
Sharp Shoulder Pain With Certain Movements? Here's What It Means and What to Do
Sharp shoulder pain triggered by specific movements — and fine the rest of the time — usually points to a mechanical irritation like impingement, cuff tendinopathy, or AC joint pain that flares in a particular position. It's typically not serious. Identifying and temporarily modifying the trigger movement, then strengthening the shoulder, usually settles it. Sharp pain with catching, instability, or after an injury deserves a closer look.
1 min read
Shoulder Bursitis: Symptoms, Causes & PT Treatment
Shoulder bursitis is inflammation of the bursa — a small fluid-filled cushion under the top of the shoulder blade that reduces friction. It causes pain with reaching and overhead movement, often alongside rotator cuff irritation. It's usually not serious and responds well to physical therapy and load management. A hot, red, swollen shoulder with fever is different and needs urgent medical care.
1 min read
Shoulder Feels Like It's Catching? Here's What It Means and What to Do
A shoulder that catches, snags, or briefly gets "stuck" during movement can come from soft tissue or the shoulder blade gliding unevenly — often harmless — or from a labral issue or instability when it's paired with pain or a feeling of slipping. Painless catching usually just needs better shoulder-blade control. Catching with pain, instability, or a history of dislocation is worth a physical therapy assessment.
1 min read
Shoulder Impingement: Symptoms, Causes & PT Treatment
Shoulder impingement is pain that occurs when the rotator cuff tendons and bursa get compressed or irritated as you raise your arm — often felt as a pinch partway up. It overlaps closely with rotator cuff tendinopathy. It's not dangerous and responds well to physical therapy focused on rotator cuff and shoulder-blade strength. Most people improve within 6–12 weeks without surgery.
1 min read
Shoulder Keeps Popping Out (Instability): Symptoms, Causes & PT Treatment
Shoulder instability means the ball of the joint slips partly (subluxation) or fully (dislocation) out of its socket, or feels like it might. It often follows a dislocation or develops in people with naturally loose joints. Physical therapy that strengthens the rotator cuff and shoulder-blade muscles is the cornerstone of treatment; surgery is considered for recurrent dislocations or structural damage. A shoulder that's dislocated and won't go back needs emergency care.
1 min read
Shoulder Labral Tear (SLAP): Symptoms, Causes & PT Treatment
The labrum is a rim of cartilage that deepens the shoulder socket and helps keep the joint stable. A labral tear can cause deep shoulder pain, catching or clicking, and a sense of instability — common in throwing athletes and after a fall or dislocation. Many tears are managed successfully with physical therapy to strengthen and stabilize the shoulder; surgery is reserved for select cases.
1 min read
Shoulder Pain and Stiffness Getting Dressed? Here's What It Means and What to Do
Pain and stiffness reaching to put on a shirt or jacket usually means lost shoulder motion, most often from frozen shoulder or rotator cuff irritation. Frozen shoulder is a common culprit because it limits motion in every direction. It's not dangerous, but frozen shoulder responds best to early, well-dosed physical therapy — so don't just wait it out if it's worsening.
1 min read
Shoulder Pain at Night When Sleeping? Here's What It Means and What to Do
Night shoulder pain — especially when lying on the painful side — is very common with rotator cuff irritation and frozen shoulder. Lying down compresses irritated tissue and removes daytime distractions, so the ache feels worse. It's usually not dangerous. Sleep position changes and treating the underlying problem with PT typically help. Persistent night pain with weakness or a recent injury deserves evaluation.
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Shoulder Pain That Won't Go Away? Here's What It Means and What to Do
Shoulder pain lasting more than 6–12 weeks is usually a persistent overuse problem — most often rotator cuff tendinopathy that hasn't been loaded back to full strength, or a frozen shoulder working through its slow course. Persistent pain rarely means serious disease, but it does mean the shoulder needs a structured plan rather than continued rest. A PT can break the cycle. New weakness or red flags should always be checked.
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Shoulder Pain When Lifting Your Arm Overhead? Here's What It Means and What to Do
Pain when raising your arm overhead — especially a pinch partway up — usually points to the rotator cuff tendons or bursa being irritated or compressed, known as impingement or cuff tendinopathy. It's the most common shoulder complaint and rarely serious. Modifying overhead activity and progressively strengthening the cuff and shoulder blade typically fix it. See a PT if it lasts beyond 2–3 weeks or comes with weakness.
1 min read
Shoulder Pain When Reaching Forward? Here's What It Means and What to Do
Pain when you reach forward — for a seatbelt, a shelf, or a cup — usually comes from rotator cuff tendons or the bursa being loaded in that position, often with some impingement. It's typically an overuse issue and not serious. Modifying the aggravating reaches and strengthening the cuff and shoulder blade usually resolve it. Persistent pain, weakness, or catching is worth a PT assessment.
1 min read
Shoulder Weakness When Lifting? Here's What It Means and What to Do
Weakness lifting your arm can simply reflect a painful, irritated rotator cuff "holding back," or it can signal a rotator cuff tear — especially if the weakness is sudden and significant after an injury. Pain-limited weakness often improves as the shoulder settles and strengthens. True, marked weakness after a fall or pull deserves prompt evaluation to check for a tear or nerve issue.
1 min read
Torn Rotator Cuff: Symptoms, Causes & PT Treatment
A torn rotator cuff is a tear in one of the tendons that lift and steady your arm. It can happen suddenly from an injury or gradually with age. Signs include shoulder pain, night pain, and weakness lifting the arm. Many tears — especially gradual, partial ones — are managed successfully with physical therapy and don't need surgery. Larger or sudden traumatic tears with major weakness should be evaluated promptly.
1 min read
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