A foreign object can enter the body through an orifice such as the nose or ear and can cause blockages and possibly infection.
The nose
If a foreign object is pushed up the nose, it should be treated with caution as it can restrict breathing and be further inhaled internally becoming a choking hazard.
If a foreign object enters the ear and becomes lodged it can cause temporary deafness and damage to the ear canal and the eardrum.
If there is an insect in the ear:
‘Button’ batteries are particularly dangerous if lodged in the ear or nose and should be treated as an emergency. They must be removed as soon as possible as they may leak chemicals that can burn or cause bleeding.