Nosebleeds (epistaxis, nose bleed) can be dramatic and frightening. Fortunately, most nosebleeds are not serious and usually can be managed at home, although sometimes medical intervention may be necessary.
Systemic disease can cause nosebleeds. Nosebleeds may be due to inflammation and exacerbated by immune system response.
This Medscape article gives physicians advice on how to treat a nosebleed.