Blood clots can and do form in the buttock, though they receive far less attention than clots in the calves, thighs, or lungs. The gluteal region is threaded with branches of the internal iliac artery and its accompanying veins, and clots can develop on either the arterial or venous side. Some involve rare anatomical variants, while others stem from trauma, surgery, or cosmetic procedures. The range of ways a clot can show up in the buttock is broader than most people expect.
Arterial Clots in the Buttock
The buttock receives blood from the superior and inferior gluteal arteries, branches that leave the pelvis and fan out through the gluteal muscles. When one of these arteries becomes narrowed or blocked by a clot, the result is often a cramping pain during walking that eases with rest. One published case documented a patient with left buttock claudication that appeared consistently after about 150 meters of walking and disappeared with a short break. Selective imaging of the internal iliac artery revealed a tight narrowing at the origin of the superior gluteal artery, and a stent placed inside the vessel resolved the pain completely within three months.1Joint Bone Spine. Buttock claudication disclosing a thrombosis of the superior left gluteal artery
A rarer scenario involves a blood vessel that most people do not even have. During fetal development, the sciatic artery supplies the growing leg, but it normally shrinks away as the femoral artery takes over. In roughly 0.05 to 0.06 percent of people, the sciatic artery never fully disappears, persisting as the main blood supply to the lower limb. Because this vessel runs through the buttock along a path that exposes it to repeated pressure and trauma, it is prone to complications including clot formation. A reported case involved a 65-year-old man who developed sudden buttock pain from a clot inside his persistent sciatic artery.2CMAJ. Thrombosed persistent sciatic artery presenting with pain in the buttock
Venous Clots and Sciatica-Like Pain
Venous clots in the buttock region tend to present differently from arterial ones. Instead of cramping with exertion, they often produce swelling, a deep ache, and in some cases symptoms that closely mimic sciatica, the shooting pain that radiates down the back of the leg. The reason is anatomical: the gluteal veins and, when present, the persistent sciatic vein run alongside or directly against major nerves. When one of these veins becomes swollen with a clot, it can physically press on the sciatic nerve.
The first documented case of deep vein thrombosis in a persistent sciatic vein described exactly this mechanism. Researchers concluded that the pain originated from direct mechanical compression of the thrombosed vein on the sciatic nerve. Because the problem was vascular rather than structural, surgical nerve decompression would not have helped, and the patient was treated with blood-thinning medication instead.3PubMed Central. Sciatica secondary to deep venous thrombosis of the persistent sciatic vein: the first case in the literature
Even without a rare vessel variant, venous congestion in the buttock can produce nerve symptoms. A review of mechanisms behind nerve root pain highlighted that congestion in the superior and inferior gluteal veins, the main veins draining the buttock, can create pressure on nearby nerves outside the spine itself.4PubMed. Venous congestion as a central mechanism of radiculopathies That means someone experiencing what feels like a back or hip problem may actually have a vascular issue in the gluteal region. It is an underappreciated diagnostic blind spot.
How Piriformis Syndrome Can Trigger Deep Vein Thrombosis
The piriformis is a small, deep muscle in the buttock that lies directly over the sciatic nerve and, just as critically, over the veins and arteries exiting the pelvis. When this muscle goes into severe spasm or becomes enlarged, it can squeeze both nerves and blood vessels like a vise. The resulting condition, piriformis syndrome, is usually discussed in terms of sciatica-like leg pain, but its vascular consequences are real and sometimes dangerous.
Research has outlined how piriformis syndrome can lead to swelling of the leg and full-blown deep vein thrombosis. The mechanism is entrapment of the vessels passing beneath the muscle, secondary to the severe spasm and enlargement of the piriformis and neighboring rotator muscles. Both leg swelling and DVT can occur as independent complications of this entrapment.5PubMed. Swelling of the leg, deep venous thrombosis and the piriformis syndrome In other words, a muscular problem in the buttock can create a chain reaction that ends in a blood clot. This is worth knowing because piriformis syndrome is often dismissed as a minor orthopedic nuisance, and the vascular dimension is rarely mentioned outside specialty literature.
Cosmetic Procedures and Buttock-Related Clots
The rising popularity of gluteal augmentation, both surgical and nonsurgical, has brought a new category of buttock-related clot risk into sharp focus. The Brazilian butt lift, which involves injecting a patient’s own fat into the buttock, carries well-documented risks of deep vein thrombosis and pulmonary embolism. A safety review by the British Association of Aesthetic Plastic Surgeons listed thrombosis as a major complication of gluteal fat grafting, alongside fat embolism, blood loss requiring transfusion, sepsis, and sciatic nerve injury.6Aesthetic Surgery Journal. The British Association of Aesthetic Plastic Surgeons (BAAPS) Gluteal Fat Grafting Safety Review and Recommendations
Injectable fillers pose their own dangers, sometimes catastrophic ones. A case report described a 26-year-old woman with no prior medical problems who developed acute shortness of breath roughly 16 hours after receiving a gluteal filler injection at a center in Cairo. She was provisionally diagnosed with high-risk pulmonary embolism and died of cardiac arrest within hours of arriving at the emergency room.7PubMed Central. Fatal pulmonary embolism following injectable gluteal filler usage: a case report Though pulmonary embolism is the downstream killer in these cases, the clotting process starts locally, in the vessels disrupted by the injection itself.
Silicone injections, often performed outside regulated medical settings, bring a longer-term problem. Silicone can migrate through tissues over months or years, lodging in the lower extremities and provoking chronic inflammation. One patient developed a three-year pattern of recurrent swelling, cellulitis, and migratory superficial blood clots in both legs. Duplex ultrasound showed a characteristic “snowstorm” pattern in the tissue, and imaging confirmed that silicone deposits had migrated from the original injection site into the lower extremities.8PubMed Central. Recurrent Superficial Thrombophlebitis Secondary to Migrated Silicone: A Diagnostic Challenge The ongoing foreign-body reaction kept triggering clots in superficial veins, turning a single cosmetic procedure into years of vascular problems.
Trauma, Hematomas, and Compartment Syndrome
A hard fall or direct blow to the buttock can damage gluteal blood vessels without breaking the skin, and the resulting internal bleeding can create a large, expanding mass of clotted blood. One case report described a patient who developed an acute hemorrhagic mass in the right buttock after blunt trauma. There were no obvious external signs of a major vascular injury, yet imaging revealed diffuse damage to branches of the inferior gluteal artery.9PubMed Central. Blunt injury to the inferior gluteal artery: case report of a rare “near miss” event The authors stressed the importance of considering arterial injury when buttock pain and swelling follow a traumatic event, even when the presentation seems benign on the surface.
If blood continues to pool inside the enclosed gluteal muscle compartments, the pressure can build to the point where it cuts off circulation to the tissue itself. This is gluteal compartment syndrome, and while it is rare, it is a surgical emergency. A published case involved a 51-year-old patient who underwent a bone marrow aspiration from the posterior iliac crest, a routine procedure, but developed excessive bleeding at the puncture site. Rising pain, tenderness, and buttock swelling followed. Pressure measurements inside the gluteal compartment confirmed the diagnosis, and emergency surgery was required to relieve the trapped blood and restore circulation.10PubMed Central. Gluteal Compartment Syndrome following an Iliac Bone Marrow Aspiration The takeaway is that any procedure involving the gluteal or pelvic region, even a needle aspiration, can occasionally lead to dangerous bleeding and localized clotting.
Recognizing and Diagnosing a Buttock Clot
Buttock clots do not announce themselves the way a swollen, red calf does. The symptoms vary depending on which vessel is involved. An arterial clot tends to produce cramping or aching during movement, especially walking, that fades with rest. A venous clot may cause a deep, persistent ache, swelling in the buttock or the leg below it, and sometimes skin color changes. When a clot presses on the sciatic nerve, the pain can shoot down the back of the thigh and into the calf, making it almost indistinguishable from a disc problem in the lower spine.
Diagnosis is tricky because several other conditions produce overlapping symptoms. Pelvic tumors, pregnancy, and fluid collections like lymphoceles can all compress the iliac vein or its branches from the outside, producing swelling and pain that closely resemble DVT. Imaging is typically needed to sort things out. As one radiology review noted, both careful clinical evaluation and imaging studies are essential to distinguish true DVT from extrinsic compression of the veins by other structures in the pelvis.11Ultrasonography. Ultrasound evaluation of clinical mimics of deep vein thrombosis
Duplex ultrasound is usually the first-line tool for suspected venous clots, while CT angiography or conventional angiography may be needed for arterial problems. In cases involving rare anatomy like a persistent sciatic artery, standard imaging protocols may miss the vessel entirely because radiologists are not expecting it to be there. If you develop sudden buttock pain with no clear musculoskeletal explanation, particularly if it is accompanied by leg swelling, skin discoloration, or unexplained difficulty walking, the possibility of a vascular cause deserves serious consideration rather than being written off as a pulled muscle.
Who Is at Higher Risk
The same factors that increase clot risk elsewhere in the body apply to the buttock: prolonged immobility, recent surgery, active cancer, obesity, and inherited clotting disorders. But several risk factors are more specifically tied to the gluteal region.
- Prolonged sitting: The buttock bears the body’s weight during sitting, and hours of uninterrupted pressure can slow venous return from the gluteal veins. Long-haul travel, desk work, and wheelchair use all apply pressure directly over the vessels most at risk.
- Cosmetic injections: As described above, fat grafting, filler injections, and especially unregulated silicone injections disrupt local tissue and vasculature, creating conditions ripe for clot formation.
- Piriformis pathology: A chronically tight or spasming piriformis muscle can physically compress venous outflow from the pelvis, raising the risk of DVT even in people without other predisposing factors.
- Rare vascular anatomy: A persistent sciatic artery or vein, present in a small fraction of the population, is inherently vulnerable to thrombosis because of its exposed course through the buttock.
Pregnancy deserves its own mention. The risk of venous thromboembolism during pregnancy is roughly four times higher than in non-pregnant women of the same age, and it climbs further in the third trimester.12BMJ. Diagnosis and management of deep vein thrombosis in pregnancy The enlarging uterus compresses the pelvic veins, slowing blood flow through the entire lower body including the gluteal vasculature. While leg DVT gets the spotlight during prenatal care, the pelvic and gluteal veins are under the same hemodynamic strain. Pelvic vein clots in pregnancy sometimes present as buttock, hip, or lower back pain rather than leg swelling, which can cause delays in diagnosis.
When Buttock Pain Turns Out to Be Vascular
The most important practical point for anyone reading this is that buttock pain is almost always musculoskeletal and almost never a blood clot. Strained gluteal muscles, piriformis irritation, sacroiliac joint dysfunction, and lumbar disc problems account for the vast majority of buttock pain seen in primary care. Vascular clots in the buttock are uncommon enough that most physicians have never encountered one.
That said, certain red flags should prompt a closer look. Sudden onset of severe buttock pain without an obvious injury, especially when paired with swelling, skin changes, or a leg that feels heavy or cool to the touch, warrants urgent evaluation. Pain that mimics sciatica but does not respond to typical treatments like physical therapy or anti-inflammatory drugs may also have a vascular origin, particularly if there is leg swelling on the same side. A history of recent gluteal injections, cosmetic procedures, or pelvic surgery raises the index of suspicion further.
If imaging reveals a clot, treatment generally follows the same principles as clots elsewhere: anticoagulant therapy for venous thrombosis, and sometimes catheter-based intervention or stenting for arterial blockages. The persistent sciatic artery cases, for instance, are typically managed with anticoagulation first, moving to surgical options if blood flow to the leg is threatened. Gluteal artery stenosis, as in the buttock claudication case described above, can sometimes be resolved with a stent in a single procedure. Recovery depends heavily on how quickly the diagnosis is made, which circles back to the central problem: nobody expects to find a blood clot in the buttock, so it takes longer to look for one.