gnawing (?.)

• ablative
• abradant
• abrasive
• ache
• aching
• acute
• acute pain
• afflictive
• agonizing
• angina
• atrocious
• attritive
• backache
• bellyache
• bite
• biting
• boring pain
• cephalalgia
• chafing
• charley horse
• colic
• collywobbles
• cramp
• cramping
• cramps
• crick
• cruel
• darting pain
• distressing
• earache
• erosive
• excruciating
• fret
• fretting
• fulgurant pain
• galling
• girdle pain
• grave
• grinding
• gripe
• gripes
• griping
• gut-ache
• hard
• harrowing
• harsh
• headache
• heartburn
• hemicrania
• hitch
• hurtful
• hurting
• jumping pain
• kink
• lancinating pain
• megrim
• migraine
• nip
• odontalgia
• otalgia
• painful
• pang
• paroxysm
• paroxysmal
• piercing
• pinch
• poignant
• prick
• pungent
• pyrosis
• racking
• rasping
• seizure
• severe
• sharp
• sharp pain
• shoot
• shooting
• shooting pain
• sick headache
• spasm
• spasmatic
• spasmic
• spasmodic
• splitting headache
• stab
• stabbing
• stabbing pain
• stinging
• stitch
• stomachache
• thrill
• throbbing pain
• throes
• toothache
• tormen
• tormenting
• torturous
• tweak
• twinge
• twitch
• wrench