What does the Bible say about God's sovereignty in healing?

In 2 Kings 20, we see God's sovereign power displayed when Hezekiah, confronted with sickness and impending death, earnestly prays for healing. God not only hears his prayer but also sends the prophet Isaiah to announce his recovery and prolong his life by fifteen years. This event underscores the Reformed belief that God is actively involved in the lives of His people, governing all events, including sickness and healing, according to His divine will. God's promises and interventions showcase that He is the ultimate authority who has the power to change our circumstances, reminding us that our hope is firmly placed in Him alone.