They call on elders, not faith healers. Anointing oil has a variety of interpretations. It is holy and has sacred power. For years, just done for the dying, ironically. Many examples from ancient times.
Physical health is intertwined with spiritual health.
Man born blind in John 9. His illness was an occasion for God's glory. Every calamity should be viewed this way. Few things are more healing than knowing your sin and guilt has been removed. The emphasis is on your relationship with God.