Shore final fought in opposition to Youssef Zalal in November, struggling a second-round submission defeat.
“For everything of my 20’s, preventing and coaching was my life and sole focus, nevertheless, the previous few weeks/months have proven that is now not the case,” he added.
“And I at all times promised myself once I was mentality checked out I’d retire from the game moderately than the game retire me. Injures have caught up with me after a lifetime within the sport.
“I am leaving with my psychological [health] in test, good well being, financially steady and am totally prepared to maneuver on to the long run.”
In his prolonged publish, Shore thanked the UFC, his household, mates, coaches and health club.
“What a journey,” he added. “For as soon as, I can lastly say I am pleased with what I’ve achieved and at all times did my finest.
“Hopefully, when individuals consider Welsh MMA they will at all times consider Tank Shore. Massive like to you all. Tank out.”