A lump on or near the collarbone has a wide range of possible causes, from a temporarily swollen lymph node fighting off a throat infection to, less commonly, a bone tumor or a sign of cancer that has spread from somewhere else in the body. The collarbone sits at a crossroads of anatomy where lymph nodes, joints, bone, muscle, and major blood vessels all converge in a small space, so a noticeable bump in this area can originate from any of those structures. Most collarbone lumps turn out to be benign, but because the supraclavicular region is also a known site where certain cancers announce themselves, any new, persistent, or growing lump here deserves medical evaluation.
Swollen Lymph Nodes Are the Most Likely Explanation
You have clusters of lymph nodes just above and below your collarbone, in the hollow areas called the supraclavicular fossae. These nodes filter lymph fluid from the head, neck, chest, and arms. When your body is fighting an infection, nearby nodes swell as they ramp up immune activity. Upper respiratory infections, ear infections, dental infections, and skin infections on the scalp or arm can all cause a node near the collarbone to puff up into a palpable lump. This kind of swelling is usually tender, somewhat movable under the skin, and resolves within a few weeks once the infection clears.
Tuberculosis is a less common but well-documented infectious cause. TB can involve cervical and supraclavicular lymph nodes simultaneously, sometimes producing multiple firm, matted lumps that may eventually drain through the skin in a condition historically called scrofula. A case report documented simultaneous involvement of cervical, supraclavicular, and pretracheal lymph nodes along with overlying skin changes due to Mycobacterium tuberculosis.
1PubMed Central. Multiple Tubercular Cervical, Supraclavicular, and Pretracheal Lymphadenitis With Scrofuloderma: A Rare CaseOther inflammatory conditions, including sarcoidosis and autoimmune diseases like lupus, can also enlarge supraclavicular nodes. The key distinguishing feature with benign reactive nodes is that they tend to be soft, mobile, and painful, whereas nodes that are hard, fixed in place, or painless raise more concern.
When a Supraclavicular Lymph Node Signals Cancer
The supraclavicular fossa has a long-recognized relationship with malignancy. As far back as the mid-1800s, clinicians noted that cancers originating in the abdomen or chest could spread to nodes just above the collarbone. The left supraclavicular node in particular, sometimes called Virchow’s node, became known as a sentinel for abdominal cancers because the thoracic duct empties into the left subclavian vein in that area, giving cancer cells a direct lymphatic route from below the diaphragm.
2JAMA Surgery. SIGNIFICANCE OF SUPRACLAVICULAR SIGNAL NODE IN PATIENTS WITH ABDOMINAL AND THORACIC CANCER: A STUDY OF ONE HUNDRED AND TWENTY-TWO CASESLung cancer is one of the more common malignancies to produce supraclavicular node metastases. In a study of lung cancer patients, about a quarter had supraclavicular metastases confirmed by tissue sampling, and detection of those metastases changed the treatment plan substantially. When lung cancer has spread to supraclavicular nodes, it generally means the disease is at least stage IIIb, which usually rules out surgical cure.
3PubMed. Metastases in supraclavicular lymph nodes in lung cancer: assessment with palpation, US, and CT Finding cancer in these nodes can actually spare a patient from more invasive diagnostic procedures, because a relatively simple biopsy of the accessible supraclavicular node can confirm the diagnosis and guide treatment without the need for surgery deeper in the chest.4PubMed Central. Metastatic Supraclavicular Lymph Nodes among Patients with Lung Carcinoma in a Tertiary Care Centre: A Descriptive Cross-sectional Study
Lymphomas, both Hodgkin and non-Hodgkin types, are another major cause of enlarged supraclavicular nodes. Lymphoma nodes tend to be rubbery, painless, and may grow steadily over weeks. Cancers of the stomach, esophagus, breast, kidney, and reproductive organs can also metastasize to supraclavicular nodes. A painless, firm, non-tender lump that has been growing for more than two to three weeks, especially in someone over 40 or with risk factors like smoking or unexplained weight loss, warrants prompt investigation.
Bone Tumors and Cysts in the Clavicle Itself
Sometimes the lump is not a lymph node at all but a growth within the collarbone. Primary bone tumors of the clavicle are uncommon but not vanishingly rare. In a review of 206 cases of primary clavicle tumors in East Asia, the most common types included eosinophilic granuloma (about 19%), osteosarcoma and osteochondroma (each around 9%), and Ewing sarcoma (about 8%). Tumors were most frequently found in the outer third of the clavicle, and the likelihood of malignancy increased significantly with age, particularly after 40.5PubMed. Primary clavicle tumors and tumorous lesions: a review of 206 cases in East Asia
A separate analysis of 113 clavicle bone tumors found that roughly half were malignant. Eosinophilic granuloma was again the single most common diagnosis, followed by bone metastases from cancers elsewhere in the body, plasma cell myeloma, Ewing sarcoma, and osteosarcoma. The average age of patients with malignant clavicle tumors was about 51, compared to 28 for those with benign or intermediate lesions.
6PubMed Central. Bone tumours of the clavicle: Histopathological, anatomical and epidemiological analysis of 113 casesIn younger patients, the picture looks different. A study of 38 primary clavicle tumors found that aneurysmal bone cyst was the most common diagnosis in people under 30, osteochondroma was most common in the 30-to-50 age group, and plasmacytoma predominated after age 50. Among the primary tumors, slightly more than half were benign.7Joint Diseases and Related Surgery. Clinical outcomes of tumors and tumor-like lesions located in the clavicle So a hard, bony lump on the collarbone of a teenager is more likely to be a benign cyst or growth, while the same finding in an older adult carries a higher probability of malignancy.
Cancer That Spreads to the Clavicle from Elsewhere
Distinct from cancer in a lymph node sitting above the clavicle, cancer can also metastasize directly into the bone of the collarbone. This is uncommon because the clavicle has relatively little red marrow and a sparse blood supply compared to bones like the spine or pelvis, which are more typical sites for metastatic deposits. Metastatic involvement of the clavicle has been estimated at around 2% of all tumor metastases and about 1% among lung cancer patients specifically.8PubMed Central. A rare case report: an inextricable shoulder pain as the exclusive presentation of lung adenocarcinoma with metastasis over contralateral clavicle
Because it is so uncommon, a metastatic clavicle tumor can be the first sign of a cancer that nobody knew was there. In one reported case, persistent shoulder pain turned out to be caused by lung adenocarcinoma that had metastasized to the opposite collarbone. The clavicle can also be invaded by tumors growing nearby, such as cancers of the lung apex or soft tissue sarcomas of the shoulder region.9PubMed Central. Clavicular Malignancies: A Borderline Surgical Management
Joint Problems That Produce a Visible Bump
The collarbone forms two joints: the sternoclavicular joint (where it meets the breastbone) and the acromioclavicular joint (where it meets the shoulder blade). Both can develop swellings that feel like a lump.
At the sternoclavicular joint, common causes of swelling include trauma (a partial dislocation or sprain can push the end of the clavicle forward), degenerative arthritis, and infections. Less common conditions affecting this joint include SAPHO syndrome (a constellation of bone and skin inflammation), Friedrich’s disease (a rare avascular necrosis of the inner clavicle), and Tietze syndrome (painful swelling of the cartilage near the breastbone).10PubMed Central. Swellings of the sternoclavicular joint: review of traumatic and non-traumatic pathologies A sternoclavicular joint swelling from osteoarthritis is quite common in older adults and typically creates a slowly enlarging, hard bump near the center of the chest that is more of a cosmetic concern than a medical emergency.
At the outer end of the clavicle, acromioclavicular joint problems can also create a noticeable bump. Distal clavicle osteolysis is an overuse injury in which repetitive stress on the AC joint causes the end of the clavicle to gradually resorb, leading to pain and sometimes visible widening of the joint. It tends to affect people who do a lot of overhead lifting or contact activities.11PubMed Central. Distal Clavicle Osteolysis in a 30-Year-Old Male: A Case Report AC joint separations from falls or direct blows to the shoulder are also common and can leave a persistent bump where the outer clavicle rides higher than the acromion.
Soft Tissue Masses and Vascular Causes
Not everything you feel near the collarbone originates from a lymph node, bone, or joint. The shoulder girdle region is home to various soft tissue structures, and benign soft tissue growths like lipomas (fatty lumps), ganglion cysts, and nerve sheath tumors can all present as a palpable mass in this area. Lipomas are particularly common, typically soft, mobile, and painless. Imaging is often helpful in distinguishing benign soft tissue tumors from aggressive ones, since the benign versions tend to have clear boundaries and predictable patterns on ultrasound or MRI.12PubMed Central. Soft Tissue Tumors about the Shoulder
Vascular causes are rare but worth knowing about, especially after trauma. Subclavian artery pseudoaneurysms can form after clavicle fractures. These are essentially pulsating blood-filled outpouchings that develop when the artery wall is damaged by a broken bone fragment. They can present as a growing, sometimes pulsatile mass near the collarbone and are potentially life-threatening if they rupture.13PubMed Central. Post-Traumatic Left Subclavian Artery Pseudoaneurysm Secondary to Clavicular Fracture: A Case Report and Literature Review Subclavian vessel injuries are most commonly associated with high-energy trauma or severely fragmented clavicle fractures and can also lead to blood clots and arm swelling.14PubMed Central. Subclavian vessels injury: An underestimated complication of clavicular fractures If you have a new lump near the collarbone that appeared after an injury and seems to pulse or is associated with arm numbness, swelling, or color changes, seek emergency care.
Collarbone Lumps in Children
Finding a lump on a child’s collarbone can be alarming, but the causes in children tend to skew more benign than in adults. As the bone tumor data above shows, malignancy in clavicle growths is rare in patients under 10. The most common bone-related lump in a young person is an aneurysmal bone cyst or an osteochondroma, both of which are benign.
One condition specific to newborns is congenital pseudoarthrosis of the clavicle, a rare developmental anomaly in which the two halves of the collarbone fail to fuse, leaving a painless, movable bump where the gap sits. It can mimic a birth fracture, and the distinction matters because the management is different: a fracture heals on its own, while pseudoarthrosis does not and sometimes requires surgical repair later in childhood.15PubMed Central. Bilateral congenital pseudoarthrosis of the clavicles in a newborn In teenagers, healed clavicle fractures can also leave a visible callus, a hard ridge of new bone that forms during the healing process and may persist as a permanent but harmless lump.
How Doctors Evaluate a Collarbone Lump
The workup for a collarbone lump depends on what the doctor suspects after the initial physical exam. Location, texture, mobility, tenderness, and how long the lump has been present all guide the next steps.
Ultrasound is often the first imaging tool. It is inexpensive, radiation-free, and good at distinguishing fluid-filled cysts from solid masses, and it can identify enlarged lymph nodes and characterize their internal structure. In one case, musculoskeletal ultrasound was what led to the correct diagnosis when a clavicular swelling turned out to be a metastasis from an otherwise undetected lung cancer, after a chest X-ray had come back normal.16PubMed Central. A mysterious clavicular swelling For bone lesions, plain X-rays are the starting point, and CT or MRI may follow to better characterize the growth. MRI is particularly useful for soft tissue masses and can show features like preservation of the bony outer layer, which helps distinguish certain tumors from others.17Radiology Case Reports. Primary bone lymphoma presenting as a painful supraclavicular lump
When imaging suggests something suspicious, a tissue sample is usually the next step. For lymph nodes, this is often done with a needle rather than surgery. A meta-analysis comparing two needle techniques found that core needle biopsy had substantially higher sensitivity for detecting malignancy (about 94%) compared to fine-needle aspiration (about 72%), while both had very high specificity and low complication rates.18PubMed Central. Fine‐Needle Aspiration Versus Core Needle Biopsy for Malignant Cervical Lymphadenopathy: A Meta‐Analysis and Systematic Review Core needle biopsy retrieves a small cylinder of tissue, giving the pathologist more material to work with, which is especially helpful for diagnosing lymphomas where the architecture of the node matters. Fine-needle aspiration can still be a reasonable first step for suspected carcinoma metastases, but if the result is inconclusive, a core biopsy or even a surgical excision biopsy may follow.
For suspected lung cancer staging, PET/CT scanning can assess supraclavicular nodes along with the rest of the body in one session. One study found that integrated PET/CT had a sensitivity of 92% and a negative predictive value of 93% for detecting supraclavicular metastases in lung cancer patients, though overall diagnostic accuracy was only modestly better than standard contrast-enhanced CT.19PubMed. Nonpalpable supraclavicular lymph nodes in lung cancer patients: preoperative characterization with 18F-FDG PET/CT
Practical Signs That Help You Sort Urgent from Non-Urgent
No list of signs can replace a proper medical evaluation, but a few features can help you gauge how quickly to seek attention:
- Size and growth: A node smaller than about one centimeter that appeared during a cold and is shrinking is likely reactive. A lump that is growing week over week, especially if it has reached two centimeters or more, needs evaluation sooner.
- Texture: Soft, mobile, tender lumps lean benign. Hard, fixed, painless lumps lean more concerning.
- Duration: A lump that has been present for more than three to four weeks without an obvious infectious cause should be examined by a doctor.
- Associated symptoms: Unexplained weight loss, night sweats, persistent cough, hoarseness, or difficulty swallowing alongside a supraclavicular lump raises the index of suspicion for malignancy considerably.
- Age: In children and young adults, benign causes predominate. In people over 40, new supraclavicular lumps carry a higher probability of being malignant, and the probability climbs further after 50.
- Trauma history: A lump that appeared after a fall or blow to the shoulder area is more likely related to a fracture, callus formation, or joint injury. However, a pulsating or rapidly expanding mass after trauma could indicate a vascular injury and needs emergency evaluation.
The collarbone’s position right at the surface of the body means that even small changes are easy to notice, which can work in your favor. Many people discover lumps here that they would never have felt in a deeper location, and earlier detection generally means more treatment options regardless of the cause. If you have found a new lump that does not have an obvious explanation, the most useful thing you can do is get it examined rather than trying to diagnose it by feel alone.