causalgia vs hurting

causalgia and hurting both are nouns.

Word	Noun	Adjective	Verb	Adverb
causalgia	Yes	No	No	No
hurting	Yes	No	No	No

As nouns, hurting is a hypernym of causalgia; that is, hurting is a word with a broader meaning than causalgia:

causalgia: a burning pain in a limb along the course of a peripheral nerve; usually associated with skin changes
hurting: a symptom of some physical hurt or disorder

Other hypernyms of causalgia include pain.

causalgia (noun)	hurting (noun)
a burning pain in a limb along the course of a peripheral nerve; usually associated with skin changes	a symptom of some physical hurt or disorder