1) Sensitive 
sensitive to pain; causing pain
<physiology> The process of pain transmission, usually relating to a receptive neuron for painful sensations. ... (16 Dec 1997) ... 
Type: Term Pronunciation: nō′si-sep′tiv Definitions: 1. Capable of appreciation or transmission of pain. See: nociceptor
[adj] - caused by or in response to pain
nociceptive Receiving injury; said of a receptive neuron for painful sensations.
adjective caused by or in response to pain; `a nociceptive spinal reflex`