Isaiah 53:4-5

Surely He has borne our griefs and carried our sorrows; Yet we esteemed Him stricken, Smitten by God, and afflicted.  But He was wounded for our transgressions, He was bruised for our iniquities; The chastisement of our peace was upon Him, And by His stripes we are healed.

God had a plan for the healing before the symptoms of the sickness ever appeared.  The devil sends symptoms to make us doubt the word of God. We are to believe in the unseen power of God over what we see.  We don’t deny that sickness exists we are to deny whether it has the right to be on a born-again believer.  Confess scripture over the symptoms and remind the devil he is trespassing and must leave.