Rytmihäiriö (Finnish for 'arrhythmia') is a Finnish hardcore punk, thrash metal/crossover thrash, grindcore and surmacore Helsinki-based band established in 1988 until 1992, when the band was put on a hiatus.

It had a comeback in 1998 with a number of changes in the line-up.

The band is signed to Sakara Records, and for distribution Sony.

Band has taken their main inspiration from the occult, devil worship, Finnish mixed drink Gambina and Finnish crime magazine Alibi.

Current lineup[1] Original band[3] Studio albums Compilation albums Split albums EPs Collaboration - Singles as Mokoma / Rytmihäiriö / Stam1na