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What causes bloody runny noses?

Ever since it's been cold, my daughter (10) has had a runny nose. That's no surprise because she's a kid. But recently there's been blood in her snot. Should I take her to a doctor?
There are many different things which can cause a bloody nose or blood-streaked nasal mucous. In a child, a pediatrician is the best physician to make an initial assessment and determine whether other physicians such as ear, nose, and throat (ENT) doctors should become involved. The skin lining the nasal passages is very thin and delicate which is what makes it prone to bleeding with even minor irritation. Irritating factors can include cold/dry weather; seasonal or environmental allergies; or an infection that causes typical upper respiratory 'cold' symptoms. Some other common causes of bleeding from the nose include trauma or a foreign body (in a child, most often related to nose-picking). Bleeding from the nose can also be caused by more rare conditions, including anatomical abnormalities; vitamin deficiencies; a connective tissue disorder; side effects from a medication; or a hematological disease. In the absence of other symptoms, blood-streaked mucous in a child likely represents irritation of the nasal mucosa in the setting of a viral cold. However, because there are other things which can cause these symptoms, it is always best for a pediatrician to evaluate a child's symptoms. In the case of a bloody nose, this evaluation can help ensure that other health conditions are not missed as well as recommend ways to minimize nasal dryness and irritation.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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