Crisis and Mental illness

Crisis noun - A time or state of affairs requiring prompt or decisive action.

Mental illness and crisis are semantically related. In some cases you can use "Mental illness" instead a noun "Crisis".

Mental illness noun - Any disease of the mind; the psychological state of someone who has emotional or behavioral problems serious enough to require psychiatric intervention.

Crisis and mental illness are semantically related. Sometimes you can use "Crisis" instead a noun phrase "Mental illness".