What does it mean when my nose bleeds a lot for 5-10 mins?

Epistaxis : 80% of people experience this in their lives. A common cause is dry, hot air like inside the home in the winter, causing nasal dryness and crusting. The nasal tissue cracks and bleeds easily. Treatment includes humidification in bedroom, nasal saline sprays & sometimes vaseline in the nose. It's not a major health hazard, but should an ENT doctor. There could be other problems to rule out.