What am I lacking if I bruise easily?
Short answer: Easy bruising often reflects problems with clotting or blood-vessel integrity rather than a single nutrient. Common causes include vitamin C deficiency (weakened capillaries), vitamin K deficiency (reduced clotting factors), low platelet count or platelet dysfunction, and effects of blood-thinning medications or liver disease.
Explanation
Bruises form when blood leaks from damaged small vessels into surrounding tissues. Vitamin C is required for collagen synthesis and healthy capillary walls; severe deficiency (scurvy) makes vessels fragile and increases bruising. Vitamin K is needed by the liver to activate clotting factors II, VII, IX and X; deficiency or impaired absorption prolongs bleeding. Low platelet number (thrombocytopenia) or platelet dysfunction prevents normal clot formation and leads to widespread bruises. Other non-nutritional causes include anticoagulant or antiplatelet medications (warfarin, direct oral anticoagulants, aspirin), corticosteroid use, inherited bleeding disorders (e.g., von Willebrand disease), and liver disease that impairs clotting-factor production. Age-related thinning of skin and subcutaneous fat also increases visible bruising.
Tips
- See a clinician for evaluation if bruising is new, extensive, spontaneous, painful, or accompanied by other bleeding (nosebleeds, gums, blood in stool/urine).
- Common tests: complete blood count (platelet count), PT/INR and aPTT (clotting), liver function tests, and specific tests for von Willebrand disease or vitamin levels if indicated.
- Review medications and supplements with your provider—NSAIDs, aspirin, anticoagulants, and some supplements can increase bruising risk.
- Dietary support: consume vitamin C–rich foods (citrus, berries, bell peppers) and vitamin K–rich greens if deficiency is suspected and not contraindicated by anticoagulant therapy.
- For unexplained or severe bruising, do not self-treat—seek medical assessment to identify potentially serious causes.
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