What Causes Random Bruising Without Injury?
Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 20th, 2026.
Random bruising without injury typically occurs due to blood vessel fragility, medication side effects, or underlying medical conditions. Common medications like aspirin, warfarin, and corticosteroids can increase bleeding tendency by affecting blood clotting mechanisms. Age-related skin thinning makes blood vessels more susceptible to minor trauma from daily activities you might not notice. Medical conditions such as platelet disorders, liver disease, or vitamin deficiencies (particularly B12, C, or K) can also cause spontaneous bruising. Women may experience increased bruising during hormonal changes like menstruation or menopause. If you're experiencing frequent unexplained bruising, especially with other symptoms like fatigue or excessive bleeding, consult a healthcare provider for proper evaluation and blood work.
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