We present the fabrication and electrical transport characterization of underdoped YBa$_2$Cu$_3$O$_{7-{delta}}$ nanowires. The nanowires have been realized without any protective capping layer and they show transport properties similar to those of the parent thin film, demonstrating that they have not been damaged by the nanopatterning. The current-voltage characteristics of the underdoped nanowires show large hysteretic voltage switching at the critical current, in contrast to the flux-flow like characteristics of optimally doped nanostructures, indicating the formation of a self-stabilizing hot spot. These results open up new possibilities of using the underdoped nanowires for single photon detection and for exploring the underdoped side of the YBa$_2$Cu$_3$O$_{7-{delta}}$ phase diagram at the nanoscale.
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