What Causes Pain In Upper Arm Between Elbow And Shoulder?

Pain in the upper arm between your elbow and shoulder is most commonly caused by problems with the rotator cuff, biceps tendon, or the shoulder joint itself. The rotator cuff is a group of four tendons that wrap around your shoulder. When these tendons become inflamed, partially torn, or fully torn, they send pain signals down the arm. Another frequent cause is biceps tendinitis, where the tendon that connects your biceps muscle to the shoulder becomes irritated. Less common but serious causes include a pinched nerve in the neck or a condition called frozen shoulder. Knowing exactly which structure is involved is the first step to getting the right treatment.

Is It a Rotator Cuff Problem or Something Else?

The rotator cuff is the most common source of pain in this area. Research published in the Journal of Shoulder and Elbow Surgery found that rotator cuff problems account for nearly half of all shoulder pain cases. The pain from a rotator cuff issue often feels like a dull ache deep in the shoulder that travels down the outside of the upper arm. It can make reaching overhead or sleeping on that side painful.

But not all pain in this area is the rotator cuff. The biceps tendon runs through the front of the shoulder and down the upper arm. When it gets inflamed, you feel pain in the front of the shoulder that can move down toward the elbow. A pinched nerve in the neck, called cervical radiculopathy, can also send pain into the upper arm. This pain often comes with numbness or tingling in the fingers. If you have neck pain along with arm pain, the source might be your neck, not your shoulder.

What Causes Pain In Upper Arm Between Elbow And Shoulder From Overuse?

Overuse is the main driver for most upper arm pain. Activities that involve repeated overhead motion are the biggest culprits. This includes sports like swimming, tennis, and baseball. It also includes jobs like painting, construction, or warehouse work where you lift your arms repeatedly.

When you repeat the same motion day after day, the tendons in your shoulder do not have enough time to recover. Micro-tears form in the tendon tissue. Over time, these tiny tears add up. The tendon becomes thickened, inflamed, and painful. This is called tendinopathy, not tendinitis, because the main problem is degeneration of the tendon tissue rather than acute inflammation. The American Academy of Orthopaedic Surgeons states that tendinopathy is more common than true tendinitis in chronic overuse cases.

One non-obvious insight is that poor posture makes overuse worse. When you sit with rounded shoulders and a forward head, the space inside your shoulder joint narrows. This puts extra pressure on the rotator cuff tendons every time you lift your arm. Fixing posture alone can reduce pain for some people without any other treatment.

How Do You Know If the Pain Is from a Tear or Just Inflammation?

This is a critical distinction because treatment differs. A tendon that is inflamed but not torn usually improves with rest, ice, and physical therapy. A torn tendon often needs more aggressive treatment and sometimes surgery.

There are some clues that suggest a tear. If you had a sudden pop or tearing sensation during an activity, that points to a tear. If you have significant weakness when trying to lift your arm against resistance, that also suggests a tear. The CDC reports that rotator cuff tears become more common with age, with about 30 percent of people over 60 having a tear, many without pain.

An MRI or ultrasound is the only way to confirm a tear. Do not assume you have a tear just because you have pain. Many people with full-thickness tears on MRI have no pain at all. Pain is not always proportional to the amount of damage seen on imaging. Some small tears cause severe pain, and some large tears cause none.

What About Frozen Shoulder and Other Less Common Causes?

Frozen shoulder, medically called adhesive capsulitis, is a condition where the shoulder joint capsule becomes stiff and inflamed. It causes pain in the upper arm that is different from rotator cuff pain. The hallmark of frozen shoulder is a significant loss of range of motion. You cannot lift your arm above shoulder height, and you cannot reach behind your back. The pain is often a deep ache that is worse at night.

Frozen shoulder goes through three stages: freezing, frozen, and thawing. The freezing stage is the most painful and can last 2 to 9 months. The frozen stage is less painful but the stiffness is severe. The thawing stage can take 5 to 24 months as motion slowly returns. The exact cause is unknown, but the American Academy of Orthopaedic Surgeons notes it is more common in people with diabetes and thyroid disorders.

Other less common causes include:

• Biceps tendon rupture: A complete tear of the biceps tendon at the shoulder causes a sudden pop and a bulge in the arm called a “Popeye deformity.”
• Shoulder impingement: A bone spur or tight tissue pinches the rotator cuff tendons when you lift your arm. Pain is sharp and occurs at specific angles of motion.
• Calcific tendinitis: Calcium deposits form in the rotator cuff tendons, causing intense pain that comes on suddenly. This is more common in women and people aged 30 to 50.
• Referred pain from the neck or heart: A herniated disc in the neck can send pain to the upper arm. In rare cases, a heart attack can cause pain in the left shoulder and arm. If you have chest pain, shortness of breath, or nausea along with arm pain, seek emergency care.

What Treatments Actually Work Based on Evidence?

For most cases of upper arm pain from overuse or inflammation, conservative treatment works well. Physical therapy is the most studied and effective approach. A 2020 review in the British Journal of Sports Medicine found that exercise-based therapy is as effective as surgery for many rotator cuff tears. The key is doing the right exercises consistently. A physical therapist can teach you specific moves to strengthen the rotator cuff and improve shoulder mechanics.

Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or naproxen can reduce pain in the short term. The evidence for their long-term use is weak. They do not heal the tendon. They only mask symptoms. Using them for more than two weeks without a doctor’s supervision is not recommended due to risks to the stomach and kidneys.

Cortisone injections are another option. A single injection can provide significant pain relief for weeks to months. However, repeated injections can weaken the tendon over time. The American College of Rheumatology advises limiting cortisone injections to no more than three per year in the same joint.

Surgery is reserved for cases that do not improve after 3 to 6 months of conservative care. The evidence shows that surgery for rotator cuff tears has good outcomes, but it is not always better than physical therapy alone. A study in JAMA found that for atraumatic tears, the results of surgery and physical therapy were similar after two years. Surgery is more clearly indicated for traumatic tears in younger, active people.

What Should You Avoid Doing When You Have Upper Arm Pain?

There are common mistakes people make that can make the pain worse. The first is complete rest. While resting for a few days is fine, prolonged inactivity leads to muscle weakness and joint stiffness. The shoulder joint needs controlled movement to heal. Complete immobilization for more than a week can actually worsen the problem.

Avoid overhead lifting and reaching until the pain subsides. This includes reaching for items on high shelves, throwing a ball, or doing overhead presses at the gym. These movements compress the rotator cuff tendons and can aggravate inflammation or extend a tear.

Do not ignore night pain. If pain wakes you up when you roll onto the affected side, that is a sign of significant inflammation or a tear. Sleeping with a pillow between your arm and your body can help. Some people find relief by sleeping in a recliner for a few nights to keep the shoulder in a neutral position.

Finally, avoid the temptation to stretch aggressively. Stretching a painful shoulder can make things worse if the problem is tendinopathy or a tear. Gentle range-of-motion exercises are safe, but aggressive stretching of the rotator cuff is not supported by evidence. A physical therapist can guide you on which stretches are safe and which are not.

When Should You See a Doctor for Upper Arm Pain?

Most cases of upper arm pain improve on their own within a few weeks. But some signs warrant a medical evaluation. If you cannot lift your arm above shoulder height at all, that is a red flag for a significant tear. If the pain is severe and came on suddenly after an injury, you should be seen.

Other reasons to see a doctor include pain that lasts more than two weeks despite rest and ice, numbness or tingling in your arm or hand, and pain that is worse at night or wakes you from sleep. If you have a fever along with arm pain, that could indicate an infection in the joint, which is a medical emergency.

A primary care doctor can often diagnose the cause with a physical exam. They may order an X-ray to check for arthritis or bone spurs. An ultrasound or MRI is used if a tendon tear is suspected. The National Institutes of Health recommends that imaging is not needed for most cases of shoulder pain in the first four to six weeks unless there are red flags.