Brian Wilson suffered from health problems.
Brian Wilson . The intended follow-up to Pet Sounds , Smile , was canceled for various reasons , which included Wilson 's deteriorating mental health . A mental breakdown ( also known as a nervous breakdown ) is an acute , time-limited mental disorder that manifests primarily as severe stress-induced depression , anxiety , or dissociation in a previously functional individual , to the extent that they are no longer able to function on a day-to-day basis until the disorder is resolved .