This is not medical advice. I am just sharing with you a comparison that the Holy Spirit showed me while talking to a friend.

God created a thin barrier in our guts to prevent foreign things from getting into our bloodstream. When undigested proteins, pathogens, viruses, etc. tear holes in that lining, harmful substances leak out. That creates a plethora of diseases. 

Now correlate that with our heart. He created our heart to hold truths from His word through meditating and memorizing. The enemy seeks to tear holes in our heart so that it is no longer sealed by a barrier of truth.

How does satan gain access to our hearts? Ephesians 6:16 says that he uses fiery darts to attack our faith. What weakens our faith? Fiery darts of doubt, fear, and unbelief. Hebrews 11:6 says that without faith it is impossible to please God. Destructive hidden pathogens of unforgiveness, bitterness, resentment, hatred etc. tear holes in our heart’s lining that affect our health.