Thromboembolism

By Bellaire ER Medical Team, Board-Certified Emergency PhysiciansUpdated July 4, 2026

Reviewed by board-certified emergency physicians. Walk in or call (713) 660-0001 anytime.

Thromboembolism is a blood clot that blocks a vein or artery, most often a deep vein thrombosis (DVT) in the leg or a pulmonary embolism (PE) in the lungs. Sudden shortness of breath, chest pain, or new leg swelling can be life-threatening and need immediate care. If you are in Houston or the Bellaire area, call 911 or come straight to Bellaire ER at 5302 Bellaire Blvd, where we can diagnose and treat a clot on-site 24/7.

Illustration for Thromboembolism treatment at Bellaire ER

Symptoms

  • Leg swelling: Usually in one leg, often with pain, tenderness, warmth, or red or discolored skin, which can signal a deep vein thrombosis (DVT).
  • Sudden shortness of breath: Breathlessness that comes on quickly, even at rest, is a key warning sign of a pulmonary embolism (PE).
  • Chest pain: A sharp or stabbing chest pain that often gets worse with a deep breath, coughing, or bending can indicate a clot in the lungs.
  • Rapid heartbeat: A fast or pounding heart rate, sometimes with lightheadedness or fainting, can occur as the body responds to a clot.
  • Coughing up blood: Coughing up blood or blood-streaked mucus is an alarming sign of pulmonary embolism and needs emergency evaluation.

When It's an Emergency

Visit the ER for thromboembolism if:

Your symptoms are severe, sudden, or getting worse. Don't wait — walk in to Bellaire ER or call (713) 660-0001.

Call 911 or come to the ER immediately if you have sudden shortness of breath, chest pain that worsens when you breathe in, a fast heartbeat, lightheadedness, fainting, or you are coughing up blood. These can be signs of a pulmonary embolism, which is life-threatening and needs treatment right away.

New swelling, pain, warmth, or redness in one leg can be a deep vein thrombosis. A DVT can break loose and travel to the lungs, so do not wait it out or drive far to be seen. Come straight to Bellaire ER, where on-site ultrasound can confirm or rule out a clot and treatment starts the same visit.

Your risk is higher after recent surgery, a long period of bed rest or travel, a leg cast, pregnancy or recent childbirth, cancer, estrogen-containing birth control or hormone therapy, or a prior clot. If you have these risk factors and develop warning signs, treat it as an emergency.

When It's Not an Emergency

Not every leg ache or brief shortness of breath is a clot. Muscle strains, cramps, minor joint pain, and mild bruising usually come on with activity or injury and improve with rest. If symptoms are mild, stable, and have another clear explanation, a telemedicine visit or your primary care doctor can help you decide on next steps.

Telemedicine and urgent care are also reasonable for reviewing your risk factors, discussing prevention before a long flight, or following up on blood-thinner questions. Because a missed clot can be dangerous, when there is any doubt, or when leg swelling or breathlessness is new or worsening, choose emergency care.

What Happens at Bellaire ER

When you arrive at Bellaire ER with a suspected clot, you are seen quickly by a board-certified emergency physician. We use on-site diagnostics including a D-dimer blood test and full lab work, plus ultrasound to look for a DVT in the leg and CT imaging to check the lungs for a pulmonary embolism.

If a clot is confirmed, treatment usually starts with blood-thinning medication (anticoagulants) to stop it from growing and prevent new clots. We diagnose and begin treatment in a single visit, and most patients do not need a hospital transfer.

Before you leave, your physician explains your results, starts or adjusts your medication as needed, and gives you a clear follow-up plan, including warning signs that mean you should return right away.

Prevention

You can lower your risk of clots by staying active and avoiding long periods of sitting still. On long flights or car trips, stand up, walk, and flex your calves every couple of hours and stay well hydrated.

Move as soon as it is safe after surgery, illness, or injury, and follow any prevention plan your doctor gives you, such as compression stockings or blood thinners. Not smoking and maintaining a healthy weight also reduce your risk. Ask your doctor about extra precautions if you are pregnant, have cancer, or take estrogen-containing medication.

Frequently Asked Questions

When should I go to the ER for thromboembolism?

Go to the ER or call 911 right away if you have sudden shortness of breath, chest pain that worsens with breathing, a rapid heartbeat, fainting, or you are coughing up blood, as these can signal a pulmonary embolism. New swelling, warmth, or pain in one leg can be a DVT and should also be evaluated urgently because a leg clot can travel to the lungs.

What are the symptoms of thromboembolism?

A deep vein thrombosis (DVT) typically causes swelling, pain, warmth, and redness in one leg, often the calf. A pulmonary embolism (PE) causes sudden shortness of breath, chest pain that is worse with a deep breath, rapid heartbeat, and sometimes coughing up blood or fainting. Any of these symptoms should be checked promptly.

How does Bellaire ER diagnose and treat a blood clot?

We use on-site labs including a D-dimer test, leg ultrasound to look for a DVT, and CT imaging to check the lungs for a pulmonary embolism. If a clot is found, treatment usually begins with blood-thinning medication. We diagnose and start treatment in a single visit, and most patients do not require a hospital transfer.

Who is at higher risk for a blood clot?

Risk is higher after surgery, prolonged bed rest or long travel, a leg injury or cast, pregnancy or recent childbirth, cancer, obesity, smoking, and use of estrogen-containing birth control or hormone therapy. A personal or family history of clots or an inherited clotting disorder also raises risk. Talk with your doctor about prevention if these apply to you.

Sources & Further Reading

Medical information on this page is consistent with guidance from these trusted organizations:

People also ask

When should I go to the ER for thromboembolism?

Go to the ER or call 911 right away for sudden shortness of breath, chest pain that worsens with breathing, fainting, or coughing up blood. New swelling or pain in one leg should also be checked the same day, because a leg clot can travel to the lungs.

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