Casue of nose bleeding may be in the nose or rest of the body.
Trauma to nose
Nose picking with finger very common cause of nose bleed in children
FB Nose : young children may insert some object inside nose. If it remains inside nose for longer time may cause inflammation and bleed.
Infection or inflammation in the nose/sinuses:
Structural problems in nose: like septal spu
Use of local steroid nasal spray
Drugs affecting blood clotting anticoagulents
Environmental Factors :
Too cold or too dry air
Pressure changes like in descent in aircraft
Systemic causes :
Hypertension: High blood pressure is a common cause of nose bleed in the elderly.
Blood disorders: hemophilia, leukemia, platelete disorder
Blood vessel disease: vasulitis, aneurisms
Sit up rather then lying this reduces the pressure on the veins in the nose,and helps to stop the bleeding.
Pinch the nose near the tip using the thumb and index finger for 5-10 minutes. Breathe through the mouth.
Apply ice to nose and cheeks.
Always consult ENT specialist /your physician for proper diagnosis of cause and specific treatment.