Hezekiah took measures to fortify Jerusalem. In an engineering feat for that time, he had a tunnel built from the Gihon Spring to the Pool of Siloam, channeling water into the city to assure an abundant supply during the siege. He then fortified the city's walls. Meanwhile, the Assyrian forces conquered 46 villages, including the fortress city of Lachish. While Hezekiah faced the Assyrian invasion from without, his body was struggling with a life-threatening disease from within.
Troubles often come in droves.
At 39 years of age, Hezekiah was not ready to die. And I will deliver you and this city from the hand of the king of Assyria. Hezekiah did not conclude that it was useless to pray, as though the prophetic message had made death inevitable. If we pray, God may be able to do for us that which He could not do if we did not pray. Requests for healing, however, must be made in the spirit of submission.