Unexplained Bruising — Know When to See Your GP

What unexplained bruising means

A bruise forms when small blood vessels under the skin break and leak blood, usually after an injury. Sometimes the injury is obvious. Other times, bruises appear with little or no remembered trauma. Occasional mild bruising may be harmless, especially as we age — but repeated, significant, or unusual bruising deserves assessment.

Why bruising can happen more easily

Bruising becomes more common with age because skin and blood vessels become more fragile. Certain medicines — such as blood thinners, antiplatelet medicines, steroids, and some supplements — can also increase the likelihood of bruising. Even everyday bumps may then leave marks.

When bruising may signal something more serious

Bruising is sometimes linked to underlying medical conditions affecting blood clotting, platelet levels, liver function, bone marrow, or blood vessels. It may also be associated with nutritional deficiency, infection, autoimmune disease, or rarely more serious illness. This is why persistent or unusual bruising should not be ignored.

When to see your GP

Seek review if you have:
• frequent or unexplained bruising
• very large or painful bruises
• bruises appearing in unusual places
• persistent nosebleeds, gum bleeding, or heavy periods
• fatigue, fever, weight loss, or illness with bruising
• bruising while on blood thinners
• bruising in children without clear cause

Sudden severe bruising or bleeding with dizziness or collapse needs urgent care.

What your GP may do

Your GP will ask about symptoms, medicines, injuries, general health, diet, and family history. Examination and blood tests may help check clotting, platelet count, liver function, iron levels, or other concerns. Management depends on the cause — reassurance for benign bruising and targeted treatment if an underlying condition is identified.

Reassurance and safety

Bruising is common — but ongoing or unexplained bruising deserves proper assessment. Early review supports clarity, reassurance, and safety.

This article provides general health information only and does not replace medical advice. Please speak with your GP for personalised care.