Where does “άλγος” come from?

άλγος (Greek) comes from Ancient Greek ἄλγος, from Ancient Greek ἀλέγω — I heed, trouble myself.

άλγος (Greek): pain

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	ἄλγος	pain , sorrow, trouble, grief, distress, woe;...
2	Ancient Greek	ἀλέγω	I heed, trouble myself

άλγος — Etymology, Origin & Word History | Etymology Explorer