Parashas Eikev · Passuk 7:15
GOD will ward off from you all sickness—and will not bring upon you any of the dreadful diseases of Egypt, about which you know, but will inflict them upon all your enemies.
Torah Temimah points to Yerushalmi Shabbos 14:3.
TT lemma: כל חלי (unit 2 of 2).
Sefaria — Yerushalmi Shabbos 14:3
English: It was taught: Rebbi says, “Hashem will remove from you all sickness” — this is burning fever. R’ Eliezer ben Yaakov says: this is anxious thought. R’ Avun said: this is the evil inclination, whose beginning is sweet and whose end is bitter.
Custom (Yerushalmi — further identities of “sickness”)
Fever, corrosive worry, and the yetzer hara are each identified as the “sickness” God promises to remove.