What are the signs of a blood clot in the lung?

Signs of a Blood Clot in the Lung

A blood clot in the lung, medically known as a pulmonary embolism (PE), can be serious. Recognizing warning signs early can help you get treatment faster. Here’s what you need to know.

What Do Blood Clots Feel Like?

Many people ask, “what do blood clots feel like?” Sensations vary depending on where the clot forms and how large it is. In general, you might notice:

• Localized pain or discomfort
  A tight, cramping or throbbing sensation, especially in the calf or thigh.
• Warmth and redness
  The skin over the clot may feel warmer and look red or discolored.
• Swelling
  One leg (or arm) may swell noticeably compared to the other.
• Tenderness
  Pressing on the area can hurt more than you’d expect from a bruise or muscle strain.

These signs often point to a clot in a limb (deep vein thrombosis, DVT). If a piece breaks off and travels to your lungs, you can develop a pulmonary embolism, with its own set of symptoms.

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Common Symptoms of Pulmonary Embolism

A pulmonary embolism can feel different from person to person. Symptoms may appear suddenly or develop over hours to days. Key warning signs include:

• Sudden shortness of breath
  You may feel like you can’t get enough air, even when resting. This is the most common symptom.
• Chest pain
  Often sharp or stabbing, it tends to worsen when you breathe deeply, cough, eat, bend, or stoop. It can mimic a heart attack.
• Cough
  You might cough up pink, foamy mucus or even blood.
• Rapid heart rate (tachycardia)
  Your heart may race or flutter without obvious cause.
• Lightheadedness or dizziness
  Feeling faint, weak, or confused can occur if your blood pressure drops.
• Sweating
  Unexpected sweating, often profuse and cold.
• Anxiety or a sense of doom
  A sudden feeling of panic can accompany a PE.

Less common signs:

• Fever
  A low-grade fever (100–102°F / 37.8–38.9°C).
• Leg pain or swelling
  Particularly in one calf or thigh—signs of DVT that may lead to PE.
• Discolored skin
  Bluish or purple tinge on lips, nails, or skin (cyanosis).

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When to Seek Immediate Help

A pulmonary embolism can be life threatening. If you experience any of the following, call emergency services right away:

• Sudden, severe shortness of breath
• Chest pain that radiates to the arm, back, neck, or jaw
• Coughing up blood
• Feeling like you might pass out
• Rapid pulse combined with dizziness or sweating

Even milder symptoms deserve attention, especially if you have risk factors such as recent surgery, long periods of immobility (like a long flight), cancer, pregnancy, hormonal therapy, or a personal/family history of clots.

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Using an Online Symptom Checker

If you’re unsure about your symptoms, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker. It can help you sort through possible causes and decide whether to see a healthcare professional sooner.

Free, online symptom check, using the doctor approved Ubie Symptom Checker

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What to Expect at the Doctor’s Office

When you see a healthcare provider, they may:

• Review your medical history and risk factors
• Perform a physical exam, checking for leg swelling, tenderness, or signs of poor oxygenation
• Order tests, such as:
  • D-dimer blood test (to detect clot fragments)
  • CT pulmonary angiography (detailed imaging of lung vessels)
  • Ventilation-perfusion (V/Q) scan
  • Ultrasound of the legs (to look for DVT)
  • Chest X-ray or ECG (to rule out other causes)

Treatment typically involves blood thinners (anticoagulants) to stop clot growth. In severe cases, clot-busting medications or procedures to remove the clot may be needed.

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Reducing Your Risk

While some risk factors (age, genetics) can’t be changed, you can take steps to lower your chance of clots:

• Stay active—avoid sitting or lying still for long stretches
• Wear compression stockings if recommended
• Keep well hydrated, especially on long trips
• Talk to your doctor about blood thinners if you’re at high risk
• Maintain a healthy weight and quit smoking

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Final Thoughts

Blood clots in the lung are serious but treatable when caught early. Remember:

• Know what do blood clots feel like—pain, warmth, swelling in a limb may precede lung symptoms.
• Watch for sudden shortness of breath, chest pain, cough with blood, rapid heart rate, or dizziness.
• Use tools like the Ubie Symptom Checker to guide your next steps.
• Go to the emergency room or call emergency services for severe symptoms.
• Speak to a doctor promptly about anything that could be life threatening or serious.

Your health matters. If you suspect a pulmonary embolism or any alarming symptoms, don’t wait—seek medical attention right away.