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What is a blood clot?
A blood clot is a gel-like mass of blood that forms to stop bleeding after an injury. In some cases, a clot can form inside a vein or artery when it is not needed.
This can block blood flow and become a serious medical problem. Some clots are small and harmless, but others can cause life-threatening complications.
Common symptoms of a blood clot in the leg
A blood clot in a deep vein, often called deep vein thrombosis or DVT, usually affects one leg. Symptoms can include swelling, pain, and tenderness, especially in the calf or thigh.
The area may feel warm and look red or darker than usual. The pain can feel like cramping or soreness and may get worse when you stand or walk.
Symptoms of a blood clot in the lung
If a clot travels to the lungs, it can cause a pulmonary embolism, which is a medical emergency. Symptoms often appear suddenly and can be more severe than a leg clot.
Look out for shortness of breath, chest pain, a fast heartbeat, or a cough, sometimes with blood. You may also feel faint, dizzy, or extremely unwell.
Symptoms of a blood clot in the arm or other areas
Blood clots can also happen in the arm, abdomen, or brain, though this is less common. An arm clot may cause swelling, pain, warmth, and colour changes in the affected limb.
Clots in other parts of the body can cause different symptoms depending on where they are. For example, a clot in the brain may lead to sudden weakness, confusion, or trouble speaking.
When to seek urgent help
If you think you may have a blood clot, get medical advice quickly. Call 999 or go to A&E immediately if you have chest pain, breathing difficulties, collapse, or sudden weakness.
In the UK, you should not wait for symptoms to improve if they suggest a clot. Early treatment can reduce the risk of serious complications and may save your life.
Who is more at risk?
Some people are more likely to develop a blood clot. Risk factors include recent surgery, long periods of immobility, pregnancy, obesity, smoking, and certain medical conditions.
The risk can also be higher if you have had a clot before or take some medicines, including hormonal treatments. If you are unsure, speak to a GP, pharmacist, or NHS 111 for advice.
Frequently Asked Questions
Common blood clot symptoms in the leg include swelling, pain or tenderness, warmth, redness, and a feeling of tightness, often in one calf or thigh.
Common blood clot symptoms in the lung can include sudden shortness of breath, chest pain that may worsen with breathing, rapid heart rate, coughing, and sometimes coughing up blood.
Yes, blood clot symptoms can start mildly and slowly, such as slight swelling, discomfort, or warmth, and then become more noticeable over time.
No, blood clot symptoms are not always painful. Some blood clots cause little or no pain, which is why swelling, color change, or warmth may be important warning signs.
Blood clot symptoms that need emergency care include sudden shortness of breath, chest pain, fainting, coughing up blood, or severe swelling and pain in one limb.
Blood clot symptoms in the arm can include swelling, pain, redness, and warmth in the arm, shoulder, or hand, while leg blood clot symptoms often affect the calf or thigh with similar signs.
Yes, blood clot symptoms can include redness, bluish discoloration, or a pale appearance in the affected area, especially in the leg, arm, or hand.
Blood clot symptoms may feel worse with walking or standing because affected tissue can become more uncomfortable, swollen, or tight when pressure increases.
Yes, blood clot symptoms can be confused with a muscle strain because both may cause pain and tenderness, but a clot is more likely to cause swelling, warmth, and redness in one area.
Yes, blood clot symptoms can appear suddenly, especially with a clot in the lung or a large clot in a limb, causing abrupt pain, swelling, or breathing problems.
Blood clot symptoms that suggest deep vein thrombosis include swelling in one leg or arm, pain or tenderness, warmth, redness, and noticeable heaviness in the affected limb.
Yes, blood clot symptoms can sometimes happen without obvious swelling, especially early on. Pain, warmth, redness, or shortness of breath may still be warning signs.
Blood clot symptoms in the brain can include sudden weakness or numbness on one side, trouble speaking, facial drooping, vision changes, severe headache, dizziness, or confusion.
Yes, blood clot symptoms can include a rapid heartbeat, particularly when a clot affects the lungs and makes breathing harder.
Blood clot symptoms are often similar in children and adults, but children may describe pain differently or have less obvious swelling, so any unusual limb swelling or breathing trouble should be checked promptly.
Blood clot symptoms can sometimes fluctuate, but even if they seem to come and go, they should not be ignored because the clot may still be present.
After surgery, blood clot symptoms may include new swelling, pain, warmth, or redness in a leg or arm, and sudden shortness of breath or chest pain if a clot travels to the lungs.
Yes, blood clot symptoms can resemble infection because both may cause redness, warmth, swelling, and pain. A blood clot is more likely when symptoms are in one limb without a clear wound or fever.
Blood clot symptoms in only one leg can still be serious because they may indicate a deep vein thrombosis, which can lead to a pulmonary embolism if the clot moves to the lungs.
Blood clot symptoms should be evaluated by a doctor as soon as possible, especially if there is one-sided swelling, persistent pain, warmth, redness, chest pain, or sudden breathing difficulty.
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