What are the symptoms of thromboembolism?
A leg clot (DVT) usually causes swelling, pain, warmth, and redness in one leg. A lung clot (PE) causes sudden shortness of breath, sharp chest pain worse with breathing, a fast heartbeat, and sometimes coughing up blood or fainting.
Thromboembolism symptoms depend on where the clot lodges. The two patterns to recognize are a deep vein thrombosis (DVT) in the leg and a pulmonary embolism (PE) in the lungs. Knowing which symptoms belong to which helps you understand how serious the situation is.
Leg Clot (DVT) Symptoms
A DVT most often affects one leg, usually the calf, and tends to come on over hours to days:
- Swelling in one leg, sometimes making it visibly larger than the other
- Pain or tenderness, often described as a cramp or ache in the calf
- Warmth over the sore area
- Red or discolored skin
A telling feature is that these symptoms are one-sided. Swelling in both legs at once is more often a heart, kidney, or circulation issue than a clot, though it still deserves evaluation.
Lung Clot (PE) Symptoms
A PE occurs when a clot travels to the lungs. These symptoms are more dangerous and usually come on suddenly:
- Sudden shortness of breath, even while sitting still
- Sharp chest pain that worsens with a deep breath, coughing, or bending
- Rapid or pounding heartbeat
- Lightheadedness or fainting
- Coughing up blood or blood-streaked mucus
What the Symptoms Mean
Leg symptoms signal a clot that has formed but is still in place. Breathing and chest symptoms mean a clot may have already reached the lungs. Fainting, a very fast heart rate, or bluish lips suggest a large clot straining the heart and are the most dangerous signs. A clot can also be silent, especially early, so risk factors like recent surgery, long travel, pregnancy, cancer, or estrogen therapy raise the odds that new symptoms are real.
Which Symptoms Are Most Dangerous
Any breathing or chest symptom is a red flag and should be treated as an emergency. Coughing up blood, fainting, and a racing heart are the highest-concern signs. Leg symptoms alone are urgent rather than immediately life-threatening, but because a leg clot can move to the lungs at any moment, they still need prompt evaluation.
For a complete guide, see our thromboembolism page. Bellaire ER is open 24/7 at 5302 Bellaire Blvd and can confirm a clot on-site with ultrasound, CT, and lab testing. Walk in any time or call (713) 660-0001, and call 911 for sudden breathing or chest symptoms.