The meaning of Madness (mental condition) in dream | Dream interpretation
A dream of madness is never a fortunate sign but again this is something that must be taken in context of the entire dream. Should you dream of being mad yourself you will fall into grievous error unless you act to correct your actions. Being mad also denotes that you may suffer a loss of property through sickness.
To see others suffering from this shows you have false friends and should beware.