A sagging cabinet door usually shows an uneven gap and rubs at the corner opposite the hinges. Often the fix is to restore secure fastening and realign it, but if the cabinet material around the hinge screws is damaged, repeated tightening only makes the problem worse.
Support the door and identify which hinge has moved
With the door open, lift it gently toward its correct position and watch for a mounting plate or screw that moves. Do not let a heavy door hang from one hinge while you work.
Tighten sound fasteners without stripping them
If the screws still grip securely, snug them and recheck door height. A screw that no longer bites needs a proper hole repair or a fastening solution suited to the cabinet material, not an increasingly oversized screw chosen blindly.
Realign height and side position after restoring the mount
On adjustable hinges, correct the sag first and then even the gap with neighboring doors. Make small changes and share the adjustment between upper and lower hinges when appropriate.
Check for warping if the sag keeps returning
A moisture-swollen, unusually heavy, or warped door can sag again even with tight screws. If the door panel or cabinet side is damaged, repairing the structure matters more than continuing to adjust the hinge.