Table of Contents
- Blood clot facts
- What are blood clots? What does a blood clot look like?
- What causes blood clots (blood clots in veins or arteries)?
- What causes blood clots (blood clots in the heart, leaking, and other causes)?
- What are the risk factors for blood clots?
- What types of conditions are caused by blood clots (DVT and pulmonary embolism)?
- What types of conditions are caused by blood clots (AFib, atrial thrombosis, and others)?
- What are the signs and symptoms of blood clots?
- What kind of doctors treat blood clots?
- How are blood clots diagnosed?
- What tests are used to diagnose blood clots?
- What is the treatment for blood clots?
- What are the complications of blood clots?
- How can blood clots be prevented?
Quick GuideDeep Vein Thrombosis (DVT): Symptoms, Treatment & Prevention
What are the signs and symptoms of blood clots?
Signs and symptoms of blood clots in the veins
Blood clots in the veins do not allow blood to return to the heart, and symptoms occur because of this "damming effect." These clots often occur in the legs or the arms, symptoms include:
- redness, and
Most often, only one leg or arm is affected and the swelling occurs over the course of many hours. Because the leg or arm becomes red, warm and swollen, it is sometimes difficult to decide whether the cause is a DVT (deep vein thrombosis) or an infection.
On occasion, the whole leg may become very swollen, painful and turn bluish due to a blood clot located in the femoral vein in the upper leg or the iliac vein in the pelvis. This is called phlegmasia cerulia dolens. A similar situation may occur in the arm if the blood clot affects the subclavian vein in the chest.
Signs and symptoms of blood clots in the arteries
Blood clots in the arteries do not allow blood get to the affected area. Body tissue that is deprived of blood and oxygen begins to die and becomes ischemic. Symptoms of blood clots in the arteries depend upon the location of the clot. Arterial blood clots cause diseases and illnesses that are medical emergencies, and it is appropriate to activate the emergency medical system or call 911.
Heart attack: Blood clots in the coronary arteries of the heart cause a heart attack. Symptoms of a heart attack may include:
The pain also may radiate to the arm, jaw or back.
Stroke or transient ischemic attack (TIA or "mini-stroke"): Blood clots to arteries in the brain may cause a stroke or transient ischemic attack (TIA). Symptoms include:
FAST is the memory tool to remember regarding the symptoms for stroke:
- Facial drooping
- Arm weakness
- Speech difficulties
- Time (time is of the essence to try to reverse the stroke process. Call emergency services and get to a hospital.)
Antithrombotic Therapy and Prevention of Thrombosis, 9th ed: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines. Chest. 2012;141(2_suppl):
Dzsheka MS, et al. Stroke and bleeding risk in atrial fibrillation. Clin Cardiol.2014, Oct, 37(10)
Medscape. Deep Vein Thrombosis and Thrombophlebitis.
Fauci, Anthony S., et al. Harrison's Principles of Internal Medicine. 17th ed. United States: McGraw-Hill Professional, 2011.
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