Collarbone pain usually traces back to an injury or overuse problem in the bone itself or in one of the joints at either end of it, but it can also signal something less obvious, from a nerve compression issue to referred pain from an organ below your diaphragm. The clavicle sits just under your skin with almost no cushioning, connects your arm to the rest of your skeleton, and absorbs forces every time you push, pull, lift, or fall. That exposed position makes it vulnerable to a surprisingly wide range of problems. Some are minor and resolve on their own; others need prompt medical attention.
What the Clavicle Actually Does
Your collarbone is one of the few horizontal bones in the body, and it does more than just sit there looking elegant. It acts as a strut that transmits the weight of your entire upper limb to your trunk, transferring load from the outer shoulder inward toward the breastbone.1PubMed Central. Structure of Clavicle In Relation to Weight Transmission It also stabilizes your shoulder blade during arm movement, helping the scapula rotate properly so you can raise your arm overhead without pinching the soft tissues in your shoulder.2PubMed. The function of the clavicle on scapular motion: a cadaveric study Because it connects two joints, the acromioclavicular (AC) joint at the shoulder and the sternoclavicular (SC) joint at the breastbone, pain can originate from either end, from the shaft in between, or from structures that pass beneath it.
Fractures Are the Most Common Cause
If your collarbone hurts after a fall, a car accident, or a hard hit during sports, a fracture is the leading suspect. The clavicle is one of the most frequently broken bones in the body, and the break usually happens in the middle third of the shaft, where the bone is thinnest and has the least muscular protection. You will typically feel a sharp pain at the break site, see swelling, and have trouble lifting your arm on that side. A visible bump or deformity under the skin is common.
Most clavicle fractures are closed, meaning the skin stays intact. In a large study of over 400,000 patients with clavicle fractures, the overwhelming majority were closed injuries, and the most frequently associated injuries were rib fractures and spinal fractures.3PubMed Central. Clavicle fractures: Associated trauma and morbidity That matters because if you broke your collarbone in a high-energy event like a car crash, doctors will check for those associated injuries too, including collapsed lung or other chest trauma.
Treatment depends on how displaced the bone fragments are. A Cochrane review of surgical versus conservative management for midshaft fractures found that surgery may not improve arm function at one year compared to a sling and rest, though it does reduce the chance of a problematic nonunion.4Cochrane Database of Systematic Reviews. Surgical versus conservative interventions for treating middle third clavicle fractures In surgical groups, the main complication was hardware failure (about 3.4%), while in conservative groups, the main issue was symptomatic nonunion (about 11.6%). A separate trial found that fractures treated with a plate healed faster on average, around 19 weeks versus 24 weeks for nonsurgical management, but patient satisfaction was similar between the groups.5PubMed Central. The Comparison of Results of Treatment of Midshaft Clavicle Fracture between Operative Treatment with Plate and Non-Operative Treatment The practical upshot: most people heal fine without surgery, but if your fracture is significantly displaced or shortened, your doctor may recommend a plate to lower the risk of the bone not healing properly.
Acromioclavicular Joint Separation
The AC joint sits at the top of your shoulder, where the outer tip of the clavicle meets the acromion of your shoulder blade. A direct blow to the side of the shoulder, the kind that happens when a cyclist goes over the handlebars or a football player gets tackled onto the point of the shoulder, can tear the ligaments holding this joint together.6PubMed Central. Acromioclavicular joint separations The severity depends on how many ligaments are torn and how far the bones separate.
Low-grade AC separations (the ligaments are stretched or partially torn) cause localized tenderness at the top of the shoulder and pain when you reach across your body or lift your arm overhead. These usually heal with rest, ice, and a sling. Higher-grade injuries, where the clavicle is visibly pushed upward or backward, may need surgical repair. Surgical stabilization is generally recommended for the most severe types, especially when the clavicle displaces significantly behind the acromion or into surrounding muscle.7PubMed Central. The Diagnosis and Treatment of Acute Dislocation of the Acromioclavicular Joint If your outer collarbone area hurts and you can see a bump where the bone sticks up, that is worth getting imaged.
Sternoclavicular Joint Problems
The other end of your clavicle meets the breastbone at the sternoclavicular (SC) joint, and this is where collarbone pain gets potentially serious. Dislocations here are uncommon, but a posterior dislocation, where the inner end of the clavicle gets pushed backward toward your chest, can compress the trachea, esophagus, or major blood vessels sitting just behind it.8PubMed Central. Posterior dislocation of the sternoclavicular joint Case reports have described injuries to the windpipe, the esophagus, and the large veins and arteries in the upper chest from this type of displacement.9PubMed Central. Sternoclavicular joint dislocation and its management: A review of the literature
If you have pain near the breastbone after a chest impact or a fall on an outstretched arm and you notice difficulty swallowing, a sense of pressure in your throat, or shortness of breath, get to an emergency room. Posterior SC dislocations need urgent recognition and often require surgical treatment, especially when the instability recurs, because the structures at risk are life-critical.10PubMed. Sternoclavicular Joint Instability and Reconstruction Anterior dislocations (the inner clavicle pops forward) are more common and far less dangerous, though they can still be painful and require treatment if they keep dislocating.
Weightlifter’s Shoulder and Other Overuse Damage
You do not need a single dramatic injury for your collarbone to start hurting. Repetitive stress can erode the outer tip of the bone, a condition called distal clavicular osteolysis, sometimes nicknamed weightlifter’s shoulder. It develops when repeated microtrauma causes the end of the clavicle to gradually break down, producing painful bone erosion and resorption.11PubMed. A Sports Medicine Clinician’s Guide to the Diagnosis and Management of Distal Clavicular Osteolysis
The link to heavy lifting is strong. In one study, over half of patients with this condition were high-intensity bench pressers, lifting more than 1.5 times their body weight, compared to just 6% of a control group. Heavy bench pressing carried roughly a 19-fold increased risk. Lighter bench pressing, interestingly, was not a risk factor at all. Pressing more than once a week and for more than five years both independently increased risk.12PubMed. Distal clavicular osteolysis in adults: association with bench pressing intensity Another study found that combining an overhead sport like basketball, volleyball, or swimming with supplemental weight training dramatically increased risk, and that about 70% of affected patients went on to develop arthritis in the AC joint on follow-up imaging.13PubMed. Frequency, imaging findings, risk factors, and long-term sequelae of distal clavicular osteolysis in young patients
The typical symptom is a dull ache at the top of the shoulder that worsens with pressing movements and overhead activity. If you are a gym-goer and your collarbone pain is centered right at the shoulder end and flares up during bench press or shoulder press, this is a likely culprit. Treatment usually starts with backing off the aggravating movements and modifying your training.
When the Pain Is Referred from Somewhere Else
This is one of the more counterintuitive causes and catches people off guard. Your collarbone area can hurt because of a problem nowhere near the bone itself. The phrenic nerve, which runs from the neck down to the diaphragm, carries sensory signals from the undersurface of the diaphragm, the membrane covering the liver and spleen, the pericardium around the heart, and the lower lining of the lungs. When any of these structures are irritated, the brain can interpret the signal as pain in the shoulder or collarbone region, because the phrenic nerve’s sensory territory overlaps with the skin of the neck and shoulder.14European Respiratory Journal. Referred shoulder pain (C4 dermatome) can adversely impact diaphragm pacing with intramuscular electrodes
This phenomenon, sometimes called Kehr’s sign when it follows a ruptured spleen, means that collarbone or shoulder pain after abdominal surgery, after eating (if you have gallbladder disease), or after a blow to the abdomen could actually be your diaphragm telling you something is wrong underneath it.15PubMed Central. Postprandial Referred Shoulder Pain: A Case Report The pain is often felt on the left side after splenic injury or on the right side with liver or gallbladder problems. If your collarbone pain has no obvious musculoskeletal explanation and it comes with abdominal symptoms, this referral pattern is worth mentioning to your doctor.
SAPHO Syndrome and Inflammatory Causes
Sometimes collarbone pain comes with mysterious swelling near the breastbone that does not seem to be caused by infection or injury. One condition that targets exactly this area is SAPHO syndrome, which stands for synovitis, acne, pustulosis, hyperostosis, and osteitis. It is an inflammatory disorder that affects the musculoskeletal and skin systems simultaneously. Anterior chest wall pain centered on the sternoclavicular and sternocostal joints is a hallmark finding that can point to the diagnosis.16PubMed Central. SAPHO syndrome–a pictorial assay Patients often have painful swelling in the area where the collarbone meets the breastbone, sometimes accompanied by skin conditions like severe acne or pustules on the palms and soles.17PubMed. Intra-articular glucocorticosteroid injection into sternocostoclavicular joints in patients with SAPHO syndrome
SAPHO is uncommon and often underdiagnosed. If you have chronic, recurrent pain and swelling near the inner end of your collarbone and your skin has been acting up in unusual ways, it is worth asking a rheumatologist about this possibility. Treatment often involves anti-inflammatory medications and sometimes steroid injections into the affected joints.
Infection of the Clavicle
Osteomyelitis, a bone infection, can strike the clavicle, though it is rare. It may develop after bacteria spread through the bloodstream or enter through a wound or surgical site.18PubMed Central. Post-traumatic osteomyelitis of the clavicle: A case report and review of literature A systematic review pooling nearly 300 reported cases found that pain was the most frequently reported symptom, and cases split roughly evenly between bacterial and nonbacterial forms.19PubMed. Clinical characteristics and treatment of clavicular osteomyelitis: a systematic review with pooled analysis of 294 reported cases Staphylococcus aureus is the most common culprit in bacterial cases, though unusual organisms including tuberculosis and fungal pathogens have been reported.20PubMed. Osteomyelitis of the clavicle: clinical, radiologic, and bacteriologic findings in ten patients
Collarbone infection typically causes deep, persistent pain that worsens over time, along with warmth, redness, and sometimes fever. Because nontraumatic clavicular lesions are uncommon, they can be tricky to diagnose, and imaging is usually needed. If you have a painful, warm lump on your collarbone without a clear injury history, and especially if you have a fever or a weakened immune system, infection should be on the radar.
Tumors of the Clavicle
This is rare enough that it belongs low on any worry list, but it is worth knowing about. Primary bone tumors of the clavicle account for roughly 1% of all bone cancers.21PubMed Central. Clavicular Malignancies: A Borderline Surgical Management A histopathological review of 113 clavicular bone tumors found a range of types, with eosinophilic granuloma, bone metastases, and plasma cell myeloma among the most common.22Journal of Bone Oncology. Bone tumours of the clavicle: Histopathological, anatomical and epidemiological analysis of 113 cases Metastatic disease, where cancer from another organ spreads to the clavicle, is also possible. The clavicle is an unusual site for metastasis because it has relatively little red marrow and limited blood supply, with only about 2% of all metastatic tumors showing up there.23PubMed Central. A rare case report: an inextricable shoulder pain as the exclusive presentation of lung adenocarcinoma with metastasis over contralateral clavicle
Red flags for a possible tumor include pain that is persistent and progressive, worsens at night, does not improve with rest, and is accompanied by unexplained weight loss or a hard, growing lump on the bone. These are uncommon scenarios, but persistent, unexplained collarbone pain that does not fit any of the more common categories warrants imaging.
Thoracic Outlet Syndrome
The space between your collarbone and first rib is a narrow corridor through which nerves and blood vessels pass on their way to your arm. When that space gets compressed, you get thoracic outlet syndrome (TOS). Depending on whether the compressed structure is a vein, an artery, or a nerve bundle, symptoms differ. Vascular TOS involves either the subclavian vein or the subclavian artery.24PubMed. Vascular Thoracic Outlet Syndrome Venous compression can cause arm swelling and a bluish discoloration, while arterial compression may produce coldness, weakness, or pain in the arm. Neurogenic TOS, the most common form, tends to cause pain and tingling down the arm and hand.
The collarbone connection here is anatomical rather than the bone being the direct source of pain. People sometimes describe the discomfort as collarbone pain because it radiates from the area just below or behind the clavicle. TOS is more common in people with poor posture, those who do repetitive overhead work, and individuals with an extra cervical rib. If your collarbone pain comes with numbness, tingling, or color changes in your arm and hand, TOS is something to investigate.
Posture, Backpacks, and Daily Strain
Not all collarbone pain requires a dramatic diagnosis. Carrying heavy loads, especially with straps that press directly on the collarbones, can produce localized soreness. Research on schoolchildren carrying backpacks weighing about 18% of body weight showed measurable changes in head and shoulder position, with resulting strain on the cervical spine and shoulder region that can cause pain in the neck, upper back, and shoulders.25PubMed Central. Effect of backpack loading on cervical and sagittal shoulder posture in standing and after dynamic activity in school going children Adults are not immune; heavy laptop bags, cross-body straps, and poorly fitted rucksacks all apply sustained pressure directly over the collarbone and the muscles and nerves beneath it.
This type of collarbone pain is usually bilateral, dull, and associated with fatigue at the end of a long day. It improves with rest and worsens when you resume the aggravating activity. Adjusting strap width, shifting loads to a hip belt, and strengthening the muscles of the upper back and shoulders can help. If your collarbone hurts most at the end of the workday or after a long hike with a heavy pack, this ergonomic cause is probably the answer.
Collarbone Pain in Children
Kids break their collarbones more often than almost any other bone, usually from falls during play or sports. These fractures heal quickly in children and rarely need surgery. But there is a peculiar pediatric condition worth knowing about: congenital pseudarthrosis of the clavicle, where the bone never fully forms in the middle, leaving a painless lump. It usually shows up on the right side and only becomes noticeable as the child grows. Unlike a fracture, which hurts and is tender to touch, pseudarthrosis typically presents as a painless bump that becomes more prominent over time.26PubMed Central. Pediatric Clavicle Fractures and Congenital Pseudarthrosis Unraveled Parents sometimes discover it after a minor injury draws attention to the area. A plain X-ray can distinguish between the two, and pseudarthrosis rarely causes functional problems.
Implanted Devices and Post-Surgical Pain
If you have a pacemaker, defibrillator, or chemotherapy port implanted beneath your collarbone, pain in that area is not unusual. A study looking at cardiac device placement found that about 28% of patients experienced numbness or tingling around the incision site in the subclavicular region, and roughly 16% had some limitation of shoulder movement on that side.27PubMed Central. The effect on upper extremity functions of cardiac electronic device placement on the dominant hand side Pain related to the device itself tends to be more prominent in the months following implantation and gradually settles down, though some people have persistent discomfort. If post-implantation collarbone pain is worsening rather than improving, or if you notice redness, warmth, or swelling over the device, contact your care team to rule out device migration or infection.
When to Actually Worry
Most collarbone pain has a benign explanation, but certain features should prompt you to seek care quickly rather than waiting it out:
- Deformity or crepitus: A visible bump, step-off, or grinding sensation after an injury suggests a fracture or joint separation that needs imaging.
- Breathing or swallowing trouble: Pain near the breastbone end of the clavicle combined with difficulty breathing, swallowing, or a sensation of pressure in the throat could indicate a posterior sternoclavicular dislocation, which is a medical emergency.
- Arm symptoms: Numbness, tingling, color changes, or swelling in the arm and hand alongside collarbone pain point toward nerve or blood vessel compression that needs evaluation.
- Night pain and weight loss: Persistent pain that worsens at night, does not improve with rest, and accompanies unexplained weight loss raises concern for infection or tumor.
- Fever with bone pain: Warmth, redness, and fever over the collarbone suggest infection, especially if you have a weakened immune system or a recent wound in the area.
- Abdominal symptoms: Shoulder or collarbone pain that comes with abdominal pain, especially after trauma, could be referred pain from organ injury below the diaphragm.
For the majority of people, collarbone pain after a minor bump or a tough workout will settle within days to weeks with rest, ice, and over-the-counter pain relief. The pain that warrants faster attention is pain that is worsening, is accompanied by systemic symptoms like fever or weight loss, or comes with neurological signs in the arm. When in doubt, a simple X-ray can rule out most structural problems, and more advanced imaging can fill in the gaps if the X-ray is unrevealing.
How the Clavicle’s Evolutionary Design Makes It Vulnerable
The human clavicle is a product of competing demands. Research comparing clavicle structure across primates found that the bone’s internal architecture reflects the type of locomotion a species relies on. Gibbons, which swing through trees, have clavicles built to withstand one-directional bending, while orangutans, which climb more unpredictably, have clavicles remodeled for multidirectional loading.28PubMed Central. Locomotor adaptation in the hominoid clavicle through ontogeny The human clavicle evolved in a lineage that transitioned from tree-dwelling to upright walking, and it ended up as a relatively slender bone tasked with absorbing forces it was not originally shaped for. That mismatch helps explain why it breaks so readily compared to, say, the femur or tibia, and why it is susceptible to stress injuries when loaded repeatedly in ways its geometry does not handle well.