In chest pain you have a lot of sentences that are incorrect - it is bad ellipsis. Not important for me, but in case you did not notice them...
interlingua_item('YN-QUESTION pain radiate teeth back-part PRESENT ACTIVE',
[of=[body_part,teeth], to_loc=[part,back], arg1=[secondary_symptom,pain],
null=[state,radiate], null=[tense,present], null=[utterance_type,ynq],
null=[voice,active]],
[(from(eng) -
['the back'+'YN-QUESTION pain radiate teeth PRESENT ACTIVE',
[null=[part,back],null=[utterance_type,phrase]]])]).
interlingua_item('YN-QUESTION frequency increase unchanging chest-pain PRESENT ACTIVE',
[null=[action,increase], of=[adj,unchanging], arg1=[degree,frequency],
of=[secondary_symptom,chest_pain], null=[tense,present],
null=[utterance_type,ynq], null=[voice,active]],
[(from(eng) -
[unchanging+'YN-QUESTION frequency increase chest-pain PRESENT ACTIVE',
[null=[adj,unchanging],null=[utterance_type,phrase]]])]).