If you ignore a leak, it WILL NOT go away. Here are just three major problems that can result from neglecting a leak.
Ceiling Staining is a sign that your roof leaking. The leak is probably small and touch up of painting would only be needed after the repair.
Growing Mold is on the decking and the insulation would need to be replaced in that area. Home health could be affected.
Rotten Decking must be removed and replaced.