"3 Doors Down will always have a special place in my heart and it saddens me to take this time off ... But my health has to be my first priority," Roberts said on the band's official website.

Roberts did not elaborate but the website said his problems stemmed from circulation issues exacerbated by the band's performance schedule, playing nearly 300 dates a year.

3 Doors Down, founded by guitarist Roberts, lead singer Brad Arnold and bassist Todd Harrell in 1996, rose to fame with their debut album "The Better Life" in 2000, fueled by hit singles such as "Loser" and "Kryptonite."

Their latest release was in 2011 with "Time of My Life."

The group, which now consists of Arnold, Harrell, guitarist Chris Henderson and drummer Greg Upchurch, said the split was "an amicable one," with Arnold adding that Roberts would "always be welcomed back with open arms."

3 Doors Down will continue their current "Gang of Outlaws" tour as scheduled, performing across North America through June with rockers ZZ Top and country artist Gretchen Wilson.

(Reporting By Piya Sinha-Roy, editing by Jill Serjeant)

• A Permanent Economic Emergency