Praise be to Allaah.

A person’s need for medical treatment is a real need, so if we find someone who needs medical treatment but does not have enough money to pay for treatment, there is nothing wrong with giving zakaah to him, because the aim of zakaah is to meet people’s needs. End quote. 

Majmoo’ Fataawa al-Shaykh Ibn ‘Uthaymeen (18/342).