Albert Barnes Commentary Psalms 107:19

"Then they cry unto Jehovah in their trouble, And he saveth them out of their distresses." — Psalms 107:19 (ASV)

Then they cry to the Lord... - See Psalms 107:6, note; Psalms 107:13, note. The meaning here is that if the “sick” cry to the Lord, he hears them and delivers them.

This cannot mean that it “always” occurs, but it occurs “so often” as to show that God can and does interpose to save; “so often” as to encourage us to call upon him in this way when we are sick; “so often” as to lay a proper foundation for praise. Many people—very many—can recall such instances in their own lives, when they seemed to all human appearance to be drawing near to the gates of death, and when, in connection with prayer, their disease took a favorable turn, and they were restored again to health. Compare the notes at James 5:14-15.