Waking up with bruises on your arms and no memory of a previous injury can be worrying. These types of marks, which appear for no apparent reason during sleep, often have common causes, although in some cases they can be a sign of a medical condition that requires attention.

Below, we explain why bruises may appear while sleeping and what to do if they occur frequently.

What is a bruise?

A bruise (also called a hematoma) is a collection of blood under the skin caused by the rupture of small blood vessels. It usually appears after a blow, although in some cases it forms without the person noticing.

Common causes of bruises while sleeping

1. Prolonged pressure or improper posture

Sleeping on an arm or applying constant pressure to an area of the body can rupture small blood vessels, especially if the skin is sensitive. This can cause a bruise without the person waking up.

2. Capillary Fragility

With aging or certain health conditions, blood vessels can become more fragile, causing them to break easily even with mild friction.

3. Blood Thinning Medications or Supplements

The use of aspirin, warfarin, ibuprofen, or supplements such as omega-3 fatty acids and vitamin E can make clotting difficult, increasing the likelihood of spontaneous bruising.

4. Vitamin Deficiencies

A lack of vitamin C, vitamin K, or iron can affect the health of blood vessels and their clotting ability.

5. Blood Disorders

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