Thou hidest thy face, they are troubled,.... God may be said to hide his face from the creatures when he withholds their food from them, when there is a scarcity of provisions, a famine in the land; when there is no pasture for them to feed on, nor brooks of water to drink of; then are they troubled or perplexed, as in Joe 1:18 and know not what to do, nor where to go for help, but faint, and sink, and die.
So in a spiritual sense when God hides his face from his people, removes his Shechinah, or divine Majesty and Presence, as the Targum here; and withdraws the influences of his grace and Spirit; or when they have no food for their souls, or what they have is not blessed, then are they troubled, Ps 30:7.