What Is Deep Vein Thrombosis? A Vein Specialist's Guide to DVT Symptoms, Risks, and Same-Day Ultrasound
- 1 day ago
- 8 min read
Updated: 4 minutes ago
Medically reviewed by the Miller Vein clinical team. Last updated April 2026.
Deep vein thrombosis (DVT) is a blood clot that forms in a deep vein, most often in the calf, thigh, or hip. DVT is a serious condition because a piece of the clot can break loose and travel to the lungs, where it can block blood flow and become life-threatening.
Up to 900,000 Americans are affected by venous thromboembolism each year, and an estimated 60,000 to 100,000 die from it (CDC). Knowing the signs, understanding your risk, and getting a quick ultrasound when something feels off is the best way to protect yourself.
Here is what you need to know, written in plain English by Michigan vein specialists that evaluate possible blood clots every week.
What Is Deep Vein Thrombosis?
DVT happens when a clot forms inside one of the deep veins that carry blood back to the heart, usually in the lower leg. The clot partially or fully blocks blood flow. That blockage causes the classic DVT symptoms of swelling, pain, warmth, and redness in one leg.
The most serious risk of DVT is pulmonary embolism, or PE. PE occurs when part of the clot breaks free, travels through the bloodstream, and lodges in the arteries of the lungs.
PE can cause sudden shortness of breath, chest pain, lightheadedness, or sudden collapse. According to the CDC, sudden death is the first symptom in about 25 percent of people who experience a PE, which is why DVT should never be 'watched at home' once suspected.
Note: A common misconception is that a DVT clot can cause a stroke. The CDC specifically states that DVT does not cause heart attack or stroke in the standard way those events occur. The primary life-threatening complication of DVT is pulmonary embolism.
What Are the Symptoms of DVT?
DVT symptoms usually show up in one leg, not both. The most common signs are:
Swelling, often in the calf or ankle
Pain or tenderness, sometimes described as a deep cramp or charley horse that does not go away
Warmth over the affected area
Redness or a change in skin color
A feeling of tightness or fullness in the leg
Important: About half of people with a DVT have no symptoms at all (CDC). That is why people with known risk factors should not wait for a dramatic sign. An ultrasound is the only reliable way to confirm or rule out a clot.
Call 911 or go to the nearest emergency room immediately if you experience sudden shortness of breath, sharp chest pain, coughing up blood, a racing heartbeat, or fainting. These can be signs of pulmonary embolism.
Who Is at Higher Risk for DVT?
DVT can affect anyone, but certain conditions and situations increase risk. The most widely accepted risk factors include:
Age over 40, with risk increasing the older you get
Recent major surgery, hospitalization, or significant trauma (orthopedic and cancer surgery are especially high risk)
Prolonged immobility, including long-haul travel lasting more than four hours
Active cancer and some cancer treatments such as chemotherapy
Pregnancy, the postpartum period, and estrogen-containing birth control or hormone therapy
A personal or family history of blood clots
Inherited clotting disorders (known as hypercoagulable or thrombophilia conditions)
Obesity
Chronic venous insufficiency or varicose veins
Heart failure, chronic lung disease, or kidney disease
Connective tissue and autoimmune disorders such as lupus
Smoking
A note on sex and race. Lifetime VTE risk is roughly similar between men and women. Women face higher risk during pregnancy, in the three months after delivery, and while taking estrogen-containing contraceptives or hormone therapy (CDC).
Black Americans have been shown to have higher VTE incidence than white Americans in multiple U.S. studies, though research on why is ongoing.
Having one or more of these risk factors does not mean you will develop DVT. It means that if a leg symptom shows up, it is worth taking seriously rather than waiting it out.
How to Tell DVT from a Muscle Pull or Varicose Veins
A lot of people who come in worried about a clot actually have something else going on. That is reassuring, but you cannot tell the difference on your own with any reliability. Here is a rough comparison, not a diagnostic tool:
Muscle strain: Usually follows an obvious event like exercise or an awkward step. Pain changes with movement and stretching. Tends to improve over days.
Varicose veins or chronic venous insufficiency: Both legs can feel heavy, achy, or swollen, often worse at the end of the day and relieved by elevation. Visible rope-like veins may be present. Not typically warm or red.
DVT: Pain and swelling usually in one leg only, often gets worse over hours to days, and does not improve with elevation. Warmth and redness are common.
If your symptoms lean toward the DVT pattern, do not try to work it out at home. Get an ultrasound ASAP.
How Miller Vein Helps When You Suspect a DVT
Miller Vein is an independent, physician-owned vein practice that has focused exclusively on venous disease for nearly 20 years and has cared for more than 48,000 patients across Southeast Michigan and West Michigan. Because veins are our only focus, DVT evaluation is something our team does routinely.
If you are worried about a possible clot, we can perform a DVT ultrasound in our office, usually the same day you call. The ultrasound is non-invasive, painless, and takes roughly 30 minutes. A trained sonographer maps blood flow in your leg veins and a vein physician reviews the findings.
If the ultrasound confirms a DVT, we coordinate next steps immediately. Depending on the location and severity of the clot, that means sending you directly to the appropriate setting for anticoagulation therapy and close follow-up.
We do not treat acute DVTs in our office because these patients belong in a setting equipped to start blood thinners and monitor safely, but getting the answer fast is often the single most important step in protecting you from a pulmonary embolism.
If the ultrasound rules out DVT, you leave with real peace of mind and a clear explanation of what is actually causing your symptoms. In many cases the symptoms trace back to chronic venous insufficiency or varicose veins, both of which Miller Vein does treat non-surgically, usually in a single 15-minute in-office procedure.
What to Expect from a DVT Ultrasound
You do not need to fast or prepare. You can drive yourself to and from the visit. During the ultrasound, you lie back and a sonographer slides a small wand along your leg using a water-based gel. You will hear the characteristic swooshing sound of blood flow through the speakers. There is no radiation and no needles.
Most DVT ultrasound visits are completed inside an hour, including check-in, the scan, and a same-day review by a vein physician.
Insurance and Cost
A medically indicated DVT ultrasound is typically covered by commercial insurance and Medicare when symptoms or risk factors justify the study. Coverage rules vary by plan, so Miller Vein's team will verify your benefits before your visit and explain any expected costs up front. Miller Vein accepts more than 700 insurance plans.
If You Think You Might Have a DVT
Do not sit with the worry. Call Miller Vein at 877-432-2184 or schedule online here. We will work to get you in for a DVT ultrasound as quickly as possible at the location nearest you.
If your symptoms include sudden shortness of breath, chest pain, coughing up blood, or fainting, call 911 or go to the nearest emergency room. Do not drive yourself.
Frequently Asked Questions About DVT
How do I know if my leg pain is a DVT or something else?
You cannot reliably tell from symptoms alone. DVT typically causes swelling, pain, warmth, and sometimes redness in one leg, and symptoms tend to build over hours to days without an obvious injury. About half of DVTs produce no symptoms at all, so risk factors also matter. A quick ultrasound is the only way to know for sure.
Can a DVT go away on its own?
Some small clots may be broken down by the body's natural clot-dissolving system, but an untreated DVT can also extend, break off, or recur. Because the consequences of an untreated clot can be severe, the standard of care is to diagnose it with ultrasound and, if confirmed, start appropriate treatment promptly. Do not assume a clot will resolve on its own.
Can DVT cause a stroke?
In standard terms, no. The CDC states that DVT does not cause heart attack or stroke. A DVT clot travels through the venous system to the lungs, where it can cause a pulmonary embolism. Stroke from a DVT-type clot is rare and requires a specific cardiac condition that allows a clot to cross from the venous side to the arterial side.
Is it safe to fly or take a long road trip if I am worried about DVT?
Prolonged immobility of more than four hours is a known DVT risk factor. If you are at higher risk, talk with your doctor before long travel. In general, move and stretch your legs at least once an hour, stay well hydrated, avoid alcohol, and consider graduated compression stockings. If you develop one-sided leg swelling or pain during or after travel, get evaluated.
Where in Michigan can I get a DVT ultrasound?
Miller Vein offers DVT ultrasounds at every location. Same-day appointments are often available. Call 877-432-2184 or book online here.
Sources
Centers for Disease Control and Prevention. About Venous Thromboembolism (Blood Clots). cdc.gov/blood-clots/about/index.html
Centers for Disease Control and Prevention. Data and Statistics on Venous Thromboembolism. cdc.gov/blood-clots/data-research/facts-stats/index.html
Cleveland Clinic. Deep Vein Thrombosis (DVT). my.clevelandclinic.org/health/diseases/16911-deep-vein-thrombosis-dvt
Mayo Clinic. Deep Vein Thrombosis (DVT): Symptoms and Causes. mayoclinic.org/diseases-conditions/deep-vein-thrombosis
National Heart, Lung, and Blood Institute. Venous Thromboembolism. nhlbi.nih.gov/health/venous-thromboembolism
Zakai NA, McClure LA. Racial differences in venous thromboembolism. Journal of Thrombosis and Haemostasis. Cited via CDC References.
Disclaimers
General: The information on this page is provided for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. All educational content has been reviewed by Miller Vein's team of vein specialists to ensure medical accuracy and relevance. Always consult a qualified healthcare provider regarding your individual condition and treatment options.
Service-specific: A DVT ultrasound is a diagnostic study. Miller Vein does not manage acute DVT treatment in-office; confirmed DVTs are referred promptly to the appropriate setting for anticoagulation and monitoring.
Insurance: Insurance coverage varies by plan and medical necessity determination. Miller Vein's team can help verify your benefits and explain expected costs prior to any study or procedure.
Emergency notice: If you have symptoms suggestive of pulmonary embolism, including sudden shortness of breath, chest pain, coughing up blood, or fainting, call 911 or go to the nearest emergency room. Do not wait for a scheduled appointment.
HIPAA: Miller Vein is committed to protecting your privacy. For questions involving your medical information, please contact our office directly. This website may contain links to third-party websites for informational purposes. Miller Vein is not responsible for the content, policies, or practices of external sites.
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