What is trigeminal neuralgia? Trigeminal neuralgia has several names and acronyms (TN or TGN) - it can be known as tic douloureux or, due to the excruciating pain, 'the suicide disease'.  It is believed to be the most painful condition known to man.  TN is a very painful disorder of the trigeminal nerve, the largest of the cranial nerves, of which [...]