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How to Tell If You Have a Blood Clot

What is a blood clot?

Fast facts

  1. An immobile blood clot generally won’t harm you.
  2. If a blood clot breaks free and travels to your heart and lungs, it could become dangerous.
  3. Blood clots are most commonly found in the lower leg.

A blood clot is a clump of blood that has changed from a liquid to a gel-like or semisolid state. Clotting is a necessary process that can prevent you from losing too much blood in certain instances, such as when you’re injured or cut.

When a clot forms inside one of your veins, it won’t always dissolve on its own. This can be a very dangerous and even life-threatening situation.

Deep vein thrombosis (DVT) is the name for when a clot forms in one of the major veins deep inside your body. It’s most common for this to happen in one of your legs, but it can also happen in your arms, pelvis, lungs, or even your brain.

An immobile blood clot generally won’t harm you, but there’s a chance that it could move and become dangerous. If a blood clot breaks free and travels through your veins to your heart or lungs, it can get stuck and prevent blood flow. This is a medical emergency.

The American Society of Hematology estimates that DVT affects up to 900,000 Americans each year. It kills approximately 100,000 Americans annually. There’s no way to know whether you have a blood clot without medical guidance. If you know the most common symptoms and risk factors, you can give yourself the best shot at knowing when to seek an expert option.

It’s possible to have a blood clot with no obvious symptoms. When symptoms do appear, some of them are the same as the symptoms of other diseases. Here are the early warning signs and symptoms of a blood clot in the leg or arm, heart, abdomen, brain, and lungs.

You should call your doctor immediately if you think you might have a blood clot. A healthcare professional will be able to look at your symptoms and medical history and let you know what steps to take from there.

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Legs or arms

Blood clot in the leg or arm

The most common place for a blood clot to occur is in your lower leg, says Akram Alashari, M.D., a trauma surgeon and critical care physician at Grand Strand Regional Medical Center.

A blood clot in your leg or arm can have various symptoms, including:

  • swelling
  • pain
  • tenderness
  • a warm sensation
  • a pale or bluish discoloration

Your symptoms will depend on the size of the clot. That’s why you might not have any symptoms, or you might only have minor calf swelling without a lot of pain. If the clot is large, your entire leg could become swollen with extensive pain.

It’s not common to have blood clots in both legs or arms at the same time. Your chances of having a blood clot increase if your symptoms are isolated to one leg or one arm.

Heart

Blood clot in the heart

The heart is a less common location for a blood clot, but it can still happen. A blood clot in the heart could cause your chest to hurt or feel heavy. Lightheadedness and shortness of breath are other potential symptoms.

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Abdomen

Blood clot in the abdomen

Severe abdominal pain and swelling could be symptoms of a blood clot somewhere in your abdomen. These could also be symptoms of a stomach virus or food poisoning.

Brain

Blood clot in the brain

A blood clot in your brain could cause a sudden and severe headache, along with some other symptoms, including sudden difficulty speaking or seeing.

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Lungs

Blood clot in the lungs

A blood clot that travels to your lungs is called a pulmonary embolism (PE). Symptoms that could be a sign of a PE are:

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Risk factors

What are the risk factors?

Certain risk factors increase your chances of having a blood clot. A recent hospital stay, especially one that’s lengthy or related to a major surgery, increases your risk of a blood clot.

Common factors that can put you at a moderate risk for a blood clot include:

  • age, especially if you’re over the age of 65
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When to call a doctor

When to call a doctor

Diagnosing a blood clot by symptoms alone is very difficult. According to the Centers for Disease Control and Prevention, almost 50 percent of people with DVT have no symptoms. That’s why it’s best to call your doctor if you think that you might have one.

Symptoms that come out of nowhere are especially concerning. Call your local emergency services immediately if you experience any of the following:

  • sudden shortness of breath
  • chest pressure
  • difficulty breathing, seeing, or speaking

Your doctor or other healthcare professional will be able to tell whether there’s reason for concern and can send you for more tests to determine the exact cause. In many cases, the first step will be a noninvasive ultrasound. This test will show an image of your veins, which can help your doctor make a diagnosis.

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