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 . As he suffered repeated nervous breakdowns , Wilson 's contributions to the Beach Boys diminished , and his erratic behavior led to tensions with the band . Following a court-ordered removal from the care of psychologist Eugene Landy , Wilson started receiving conventional medical treatment , and in the late 1990s , he began performing and recording consistently as a solo artist . 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 .