Mastoiditis or bacterial meningiti, s which is more dangerous?

meningitis: One of the worst complications from mastoiditis is meningitis, which can be lethal.

Both problematic: In general, meningitis is more dangerous because this is an infection of the covering of the brain and has the potential to cause more severe illness. Mastoiditis is usually a chronic condition but if it is acute, the concern is that it could develop into meningitis or a brain abscess.