The band was founded in 1998 by drummer Lars Borup. However, the search for other permanent band members was unsuccessful, so Seven Thorns was put on hold in 2000. In 2004 Mik Holm joined Lars as songwriter and lead singer which led to the first complete line-up later that same year. The band's first single Artificial Night was recorded and released in the beginning of 2005 and was nominated for a Danish Metal Award.

From 2005 to 2007 Seven Thorns was put on hold with the exit of Mik and the addition of a new lead singer. The band name was changed to 7thorns, which, despite the name similarity, was not the same band musically, personally nor mentally. The original Seven Thorns was revived again in 2007 by Mik and Lars after the 7thorns project had been terminated. Although Mik does not function as an active member as such, he writes most of the music and lyrics for Seven Thorns.

Seven Thorns was ready with new line-up in late 2008 and a single entitled Forest Majesty was recorded over New Year of 2008-09 and released in March 2009 by Airbourne Records, a small Danish label.

After the release of the debut album Return to the Past in 2010 through Nightmare Records Seven Thorns signed a promotion contract with the German agency Rock N Growl. The promotion deal resulted in numerous top class reviews by magazines and e-zines from all over the world as well as radio airplay in both Europe, The United States and Japan.

They have played with In the summer of 2011 Seven Thorns embarked on their first European tour along with Circle II Circle playing multiple shows and festivals. They have since toured with American glammetal act Lillian Axe, also promoting the arrival of their new lead singer, Gustav Blide. Seven Thorns have shared the stage with bands such as Anvil, Jørn Lande, Raven and Gun Barrel.