What he did
One day a mother brought to him her boy, who, while eating, had swallowed a fishbone, which remained in his throat, and, causing great pain, threatened suffocation. St. Blaise prayed and made the Sign of the Cross over the boy, and behold, he was cured. For this reason the Saint is invoked in throat troubles.
Why he did it
ST. BLAISE gave us a glorious example of fortitude in the confession of the Faith. According to the teaching of St. Paul, confession of the Faith is necessary for our salvation. He says, "For if thou confess with thy mouth the Lord Jesus, and believe in thy heart that God hath raised Him up from the dead, thou shalt be saved. For with the heart we believe unto justice, but with the mouth confession is made unto salvation"