Hell Within is a metalcore band founded in Lowell, Massachusetts in 1998. After recording two albums as Twytch, the band changed their name to Hell Within and released Asylum of the Human Predator through Lifeforce Records in 2005. After extensive touring across the United States and some lineup changes, the band released Shadows of Vanity in 2007.
Hell Within began under the name Twytch in 1998, with guitarists Isaias Martinez and Tony Zimmerman, who met when they were music students at the University of Massachusetts, Lowell. Twytch started to develop quite a following in the Boston area. They released two independent albums, which were influenced by bands such as Slayer, Pantera, Anthrax, Deftones, Megadeth and Metallica.