"He had a pain in his tongue."

Translation: Bhí pian ina theanga.

[ishando]

Should it be 'bhí pian ina theanga aige' ?

[scilling]

Indeed it should.

[Daithi2820]

GRMMA. Shíl mé chomh maith. Is é pian i mo thoin uaireanta.

[joanmvanore]

Tuigim.

[obekim]

Or, slightly different word order? ie "Bhí pian aige ina theanga" similar to these examples from th'Internet "Bhí pian aige ina ghiall" and "... agus pian aige ina sciathán clé".

[scilling]

Yes, that would be another possibility.