Blood Clots: 5 Warning Signs You Should Never Ignore By Dr. Praveen MP | MBBS, DPM (NIMHANS), MD – General Medicine
🩺 Dr. Praveen MP
MBBS, DPM (NIMHANS), MD – General Medicine
📍 Electronic City, Bengaluru
A blood clot can develop silently and sometimes lead to life-threatening complications. Recognising the warning signs and seeking medical attention promptly can make a significant difference.
Observed every year on October 13, World Thrombosis Day raises awareness about thrombosis, its risk factors, symptoms and prevention. The campaign encourages people to understand their risk and take action when warning signs appear.
What is a blood clot?
A blood clot is a mass formed when blood changes from a liquid to a gel-like state. Clotting is a normal process that helps stop bleeding after an injury. However, a clot that forms inside a blood vessel and obstructs blood flow can be dangerous.
Two important conditions are:
- Deep vein thrombosis (DVT): A blood clot that develops in a deep vein, commonly in the leg.
- Pulmonary embolism (PE): A potentially life-threatening condition that occurs when a clot travels to the lungs and blocks blood flow.
Blood clots can also contribute to strokes and heart attacks, depending on where they form or travel.
5 warning signs of blood clots you should never ignore
1. Swelling or pain in one leg
Unexplained swelling in one leg, particularly when accompanied by pain, tenderness, warmth or redness, can be a warning sign of DVT.
The affected leg may feel heavy or uncomfortable, and the swelling may develop over hours or days.
What should you do?
Seek prompt medical evaluation if you develop unexplained one-sided leg swelling or pain. Do not assume it is simply muscle strain or fatigue.
2. Sudden shortness of breath
Sudden difficulty breathing, particularly when accompanied by chest pain, a rapid heartbeat or dizziness, may indicate a pulmonary embolism.
A pulmonary embolism can be life-threatening and requires immediate medical attention.
What should you do?
If you experience sudden or severe breathlessness, seek emergency medical care immediately. Do not wait to see whether it goes away.
3. Chest pain, especially when breathing
Chest pain that becomes worse when taking a deep breath or coughing can occur with a pulmonary embolism. Other conditions, including heart problems, can also cause chest pain.
The combination of chest pain and sudden breathlessness is especially concerning.
What should you do?
Treat sudden, severe or unexplained chest pain as a medical emergency, particularly if you also have breathlessness, faintness or sweating.
4. Sudden weakness, numbness or vision changes
A blood clot that blocks blood flow to part of the brain can cause an ischaemic stroke.
Warning signs include:
- Sudden weakness or numbness, especially on one side of the body
- Difficulty speaking or understanding speech
- Sudden loss or disturbance of vision
- Sudden dizziness, loss of balance or difficulty walking
What should you do?
Call emergency services immediately if you suspect a stroke. Note the time the symptoms began, and do not wait for them to resolve.
5. Unusual warmth, redness or pain in an arm or leg
A clot in a deep vein can cause the affected area to become warm, tender, swollen or discoloured. Although the legs are a common location, DVT can also affect an arm.
These symptoms can resemble other conditions, so medical assessment is important.
What should you do?
Seek prompt medical evaluation for unexplained limb pain, swelling, warmth or redness. Avoid self-diagnosing or starting blood-thinning medication without medical advice.
Who is at higher risk of blood clots?
Anyone can develop a blood clot, but certain circumstances can increase the risk.
Risk factors include:
- Prolonged immobility, including long journeys or bed rest
- Recent surgery or hospitalisation
- A previous blood clot or a family history of clotting disorders
- Pregnancy and the period after childbirth
- Certain hormonal medicines, including some contraceptives and hormone therapies
- Cancer and some cancer treatments
- Certain chronic illnesses and increasing age
Risk may be higher when several factors occur together. If you have known risk factors, discuss appropriate prevention measures with your healthcare professional.
How can you reduce your risk?
Although not all blood clots are preventable, several steps can help reduce risk:
- Keep moving: Avoid sitting still for prolonged periods. During long journeys, take movement breaks when possible.
- Follow medical advice after surgery: Ask your healthcare team about your individual risk and whether preventive measures are needed.
- Discuss your personal risk: Inform your doctor about previous clots, relevant family history and medicines you take.
- Follow prescribed prevention plans: If compression devices or blood-thinning medicines are recommended, use them as directed.
- Recognise symptoms early: Know the warning signs and seek appropriate medical attention without delay.
Do not start aspirin or anticoagulants on your own to prevent a blood clot. The right approach depends on your individual risk and medical history.
Can a blood clot occur without obvious symptoms?
Yes. Some blood clots cause few noticeable symptoms, and symptoms can vary depending on the location and severity of the clot.
This is why understanding your risk factors and following appropriate medical advice are important, particularly after surgery, during prolonged immobility or when other risk factors are present.
When should you seek emergency medical help?
Seek immediate emergency care for:
- Sudden or severe shortness of breath
- Sudden or unexplained chest pain
- Sudden facial drooping, weakness, speech difficulty or vision loss
- Collapse or fainting accompanied by concerning symptoms
Do not delay emergency care while waiting for an appointment or trying home remedies.
World Thrombosis Day: Awareness can save lives
World Thrombosis Day is observed annually on October 13. It provides an opportunity to educate ourselves and our communities about blood clots, recognise warning signs and understand prevention.
A simple conversation with family members, colleagues and friends can help someone recognise a potentially serious symptom and seek timely medical care.
Remember: Know the risks. Recognise the signs. Take action.
Consult Dr. Praveen MP
For general medical consultation and guidance on blood clot risk factors and prevention, contact:
Dr. Praveen MP
MBBS, DPM (NIMHANS), MD – General Medicine
📍 Electronic City, Bengaluru
📞 +91 7892377288
🌐 www.drpraveenmp.co.in
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