With regard to epistaxis (bleeding from the nose), which of the following statements are true?

It is most commonly idiopathic in origin.

It is most common in children and middle-aged people.

It commonly originates from Little’s area in the posterior aspect of the nasal septum.

After the nose has been packed, anterior septal bleeds can be cauterised using a silver nitrate stick.

It can be a cause of severe shock.