algo-, alg- (Greek: pain).algodystrophy: 
A painful local disturbance of growth, particularly due to focal aseptic necrosis of bone and cartilage;also: algesidystrophy.
 
algogenesis, algogenesia: 
The production or origin of pain.
 
algolagnia: 
A form of sexual perversion in which the infliction or the experiencing of pain increases the pleasure of the sexual act or causes sexual pleasure independent of the act; includes both sadism (active algolagnia) and masochism (passive algolagnia); also: algophilia.
 
algology: 
The study of pain.
 
algometry: 
The process of measuring pain.
 
algophilia: 
Pleasure experienced in the thought of pain in others or in oneself; also: algolagnia.
 
algophobia: 
The abnormal fear of or excessive sensitiveness to pain.
 
algospasm: 
Spasm produced by pain.
 
           |