Jamieson, Fausset and Brown on 2 Chronicles 16:12

12. Asa ... was diseased in his feet--probably the gout.

yet his disease was exceeding great--better, "moved upwards" in his body, which proves the violent and dangerous type of the malady.

yet in his disease he sought not to the Lord, but to the physicians--most probably Egyptian physicians, who were anciently in high repute at foreign courts, and who pretended to expel diseases by charms, incantations, and mystic arts. Asa's fault consisted in his trusting to such physicians, while he neglected to supplicate the aid and blessing of God. The best and holiest men have been betrayed for a time into sins, but through repentance have risen again; and as Asa is pronounced a good man (2Ch 15:17), it may be presumed that he also was restored to a better state of mind.