Bruises may be caused by anything that injures the blood vessels, allowing blood to leak out of them. Besides accidents, falls and other causes of trauma to the affected site, other causes may include:
- Use of certain medicines (e.g. aspirin, warfarin and prednisone)
- Bleeding disorders (e.g. haemophilia)
- Other medical conditions, including cirrhosis, leukaemia and some forms of anaemia
- Drug or alcohol addiction
- Deficiency of vitamin C
We become more susceptible to bruising as we get older and our blood vessels and skin become more delicate, so it’s not uncommon for older people to experience bruises of significant size without being able to recall any trauma to the tissue.
Women are more prone to bruising than men (perhaps due to hormonal differences).