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Feeling unusually dizzy, weak or tired. People who take blood thinners are also at risk for severe bleeding — especially internal bleeding —when they’re injured. You should get immediate medical care if you have any of the following symptoms:
Blood thinners don't actually thin your blood, but they can stop blood clots from forming or growing larger. Learn more about how these medications work.
Despite their name, blood thinners (also called anticoagulants) don’t actually thin your blood. They work by keeping your blood from sticking together in a clump (clotting). Blood thinners keep a clot where it is and from getting bigger and prevent new clots from forming.
Find information on blood thinners, including what they do, how they work, and who should take them. Learn about the side effects and natural alternatives.
Excessive bleeding caused by blood thinners could make you feel fatigued by causing iron-deficiency anemia. People with iron-deficiency anemia may feel tired, weak, or fatigued because their blood can’t carry enough oxygen around the body.
Aside from bleeding-related issues, there are several side effects that have been linked to blood thinners, such as nausea and low counts of cells in your blood. Low blood cell count can cause fatigue, weakness, dizziness and shortness of breath. Be careful mixing medications.
While blood thinners can be lifesaving, they also come with risks for potential long-term side effects and complications.
It may save your life if you've had blood clots or are at risk of them. But warfarin can sometimes cause serious side effects, such as heavy bleeding. It's important to have regular health checkups if you take the medicine. The same action of warfarin that stops blood from clotting can cause bleeding.
If you have been prescribed a blood thinner, it's important to pay attention to signs of bleeding, like red or black colored stool, severe headache, light-headedness, and fainting. If you notice any of these symptoms, seek medical attention right away.
Blood thinners are among the most misunderstood drugs. Despite their name, they don't "thin" blood, Rather, they discourage blood from clotting. "Anti-clotting drugs prevent potentially dangerous blood clots from developing in people at high risk," says Dr. Gregory Piazza, a cardiologist with Harvard-affiliated Brigham and Women's Hospital.