The Lumbar Nook is a location in Bowser's body in Mario & Luigi: Bowser's Inside Story. It is known to be the smallest area in his body.

During gameplay, Bowser is released from the safe that his three minions, Private Goomp, Sergeant Guy and Corporal Paraplonk tricked him into going in after Mario and Luigi defeat Junker. He then states that he has a terrible back pain and then faints.

Mario and Luigi must then go inside of this area, drill into the center of the nook after greeting Toadsworth. Then, Mario and Luigi slowly heals Bowser and Toadbert and Toadsworth have tea while Mario and Luigi are slowly healing Bowser. Then, the player must wait a few minutes for Bowser to heal before doing anything else as a Nintendo DS puts up a message to wait a while until hearing an alarm, meaning Bowser feels better.

When Bowser is healed, he feels that he has become more flexible and then uses his new Spike Ball attack he had just learned from this flexibility.


  • According to Toadbert in Toad Square, he states about having a weird dream, showing an event in the Lumbar Nook and states a code going in order from ABXYLRYXBA and the player must press these buttons in order to speed up the healing process and Bowser becomes healed instantly.