If you suspect a blood clot in your leg, get medical attention the same day. A blood clot in a deep vein, known as deep vein thrombosis (DVT), can break loose and travel to your lungs, where it becomes a life-threatening emergency called a pulmonary embolism. The good news: DVT is very treatable when caught early, and most people recover fully with the right care.
Recognize the Symptoms
DVT typically shows up in one leg, not both. The most common signs are swelling, pain or cramping that often starts in the calf, skin that looks red or purple in the affected area, and a feeling of warmth on that leg. Some people mistake it for a pulled muscle or a charley horse. The key difference is that DVT swelling and pain tend to persist and gradually worsen rather than improving with rest.
Not everyone with DVT has obvious symptoms. Some clots are discovered only when they cause complications. If you have risk factors like recent surgery, prolonged bed rest, a long flight, cancer, pregnancy, or a history of clotting disorders, take even mild leg swelling seriously.
Know When to Call 911
A pulmonary embolism happens when part of the clot breaks off and lodges in the lungs. This is a medical emergency. Call 911 or go to the nearest emergency room if you experience any of the following:
- Sudden shortness of breath
- Chest pain that gets worse when you breathe deeply or cough
- Feeling lightheaded, dizzy, or faint
- A rapid pulse or rapid breathing
- Coughing up blood
These symptoms can appear suddenly, even if your leg symptoms seemed mild. Don’t drive yourself to the hospital if you’re experiencing chest pain or dizziness.
How DVT Is Diagnosed
Doctors use a combination of clinical scoring and testing to confirm a clot. First, they’ll assess your risk level based on your symptoms, medical history, and a standardized checklist called the Wells score. What happens next depends on that risk level.
If your risk is low or moderate, you’ll typically get a blood test that measures a substance called D-dimer, which rises when your body is actively breaking down clots. A negative D-dimer result effectively rules out DVT. If the result is positive, you’ll move on to an ultrasound of your leg to look for the clot directly. If your risk is high, doctors skip the blood test entirely and go straight to ultrasound, since a negative D-dimer wouldn’t be reliable enough to rule anything out in a high-risk patient. The ultrasound is painless and takes about 15 to 30 minutes.
What Treatment Looks Like
The cornerstone of DVT treatment is blood thinners (anticoagulants). These medications don’t dissolve the existing clot. Instead, they stop it from growing larger and prevent new clots from forming, giving your body time to gradually break down the clot on its own.
Most people today are prescribed oral blood thinners that can be taken at home. These newer medications work by blocking specific clotting factors in your blood. Your doctor will likely start you on a higher dose for the first one to three weeks, then step you down to a maintenance dose. Unlike older blood thinners, these newer options don’t require frequent blood monitoring or strict dietary restrictions, which makes daily life considerably easier.
Some patients, particularly those with cancer or severe kidney problems, may instead receive injectable blood thinners or older oral medications that do require regular blood tests to keep the dose in the right range.
How Long You’ll Take Blood Thinners
Treatment duration depends on what triggered the clot. If your DVT was “provoked,” meaning it was caused by a clear, temporary risk factor like surgery, a broken bone, or extended immobility, treatment typically lasts three months. If no clear trigger is found (an “unprovoked” clot), your doctor may recommend six to twelve months of treatment, or in some cases, indefinite use to prevent recurrence. Factors like whether this is a first or repeat clot, and whether you have an underlying clotting disorder, all weigh into that decision.
Staying Active During Recovery
One of the biggest misconceptions about DVT is that you need to stay in bed. Research from multiple randomized trials shows the opposite: early walking after a DVT diagnosis does not increase the risk of pulmonary embolism, and it actually helps reduce leg pain faster than bed rest does.
Once you’ve started on blood thinners, your doctor will generally encourage you to walk and move around as tolerated. You don’t need to push through significant pain, but gentle daily walking is both safe and beneficial. Avoid activities with a high risk of injury or impact, since blood thinners make you bleed more easily. Contact sports, for example, are off the table during treatment.
Practical Steps for Daily Comfort
Elevating your affected leg above the level of your heart helps reduce swelling and discomfort. Aim for about 15 minutes at a time, three to four times a day. Lying on your back with your leg propped on a stack of pillows works well. A recliner alone usually isn’t enough elevation.
Your doctor may also recommend wearing a compression stocking on the affected leg. These stockings apply graduated pressure that helps push blood back toward your heart and can significantly reduce swelling. They feel snug but shouldn’t be painful. Most people wear them during waking hours and remove them at night.
Stay well hydrated, avoid sitting or standing in one position for more than an hour or two, and flex your ankles and calves regularly when you’re seated for long stretches. These small habits help keep blood moving through your veins.
Traveling After a DVT
Long trips, whether by plane or car, raise your clot risk because of prolonged sitting. After a DVT diagnosis, the British Thoracic Society recommends delaying air travel for at least two weeks. The International Air Travel Association takes a slightly different approach, advising that you can fly once you’re symptom-free and stable on your blood thinner.
When you do travel, get up and walk the aisle every one to two hours on a flight, or stop and walk around during long drives. Wear your compression stockings, drink plenty of water, and avoid alcohol, which can dehydrate you. Aisle seats make it easier to move freely.
Post-Thrombotic Syndrome
Between 20% and 50% of people who have a DVT develop a long-term condition called post-thrombotic syndrome (PTS) in the months or years that follow. PTS happens when the clot damages the valves inside the vein, making it harder for blood to flow back up from your leg efficiently. Severe cases, including skin ulcers, occur in 5% to 10% of DVT patients.
The symptoms overlap with the original DVT but tend to be chronic: ongoing leg pain, heaviness, cramping, swelling, itching, and tingling. Over time, you may notice skin changes like darkening or hardening of the skin around the ankle, or visible widened veins. These symptoms often worsen after standing or walking for long periods and improve with rest and elevation.
Consistent use of compression stockings and regular exercise are the most effective ways to manage PTS and may reduce your chances of developing it in the first place. Keeping your follow-up appointments after a DVT is important so your doctor can monitor for these changes early, when they’re most manageable.