People typically get nosebleeds from things like dry weather, blowing or picking. But some times a nosebleed can be more serious. Here's when to seek medical attention, says Dr. Michael C. Fabian, an ear, nose and throat (ENT) specialist in Toronto:

• If the blood is still flowing after applying ten minutes of continuous pressure to the nose. Usually, pinching your nose should stop the bleeding within five to ten minutes.
  
• If you have frequent nosebleeds. These could result from a bleeding disorder or an abnormal lesion in the nose.
  
• If you're bleeding down the back of your throat, as well as your nostril, or if you're bleeding from both nostrils. That could mean a deeper bleed.
  
• If the bleeding is rapid and copious, and/or you feel week.
  
• If you get a nosebleed as a result of a head or facial injury.