There are numerous questions being raised about the over all health of Aerosmith's Tom Hamilton and the effects of his cancer treatment. And now he's opted out of a number of Aerosmith shows on the current tour.

"Aerosmith's star Tom Hamilton has sparked fresh concerns for his health after sitting out of the band's Monsters of Rock show in Brazil on Sunday (20Oct13). The rockers performed in Sao Paulo, but Hamilton's place onstage was filled by David Hull, who has often replaced the bassist during his recent heath battles and cancer treatments.