"Healthier" depends on what you're comparing them to. Against in-ear buds, on-ears win hands down for ear hygiene. IEMs shove silicone or foam into your ear canal, trapping wax, sweat, and bacteria—that's how you get swimmer's ear or nasty fungal infections. On-ears never enter the canal, so that risk basically disappears. Against full-size over-ears, on-ears breathe better. Big leather-clad over-ears cook your ears after an hour—sweat, heat rash, even contact dermatitis. On-ears have smaller pads and more exposed surface area, so less moisture buildup. For glasses wearers, the lighter clamp force of most on-ears also means less temple pressure compared to heavy over-ears.

But on-ears bring their own downsides. The pads press directly on your ear cartilage, not around it. That can cause perichondritis in rare cases, but more commonly just soreness and tenderness after a couple of hours. People with larger ears or piercings often find on-ears genuinely painful. Then there's the volume trap: because on-ears leak sound and block little outside noise, you tend to crank the volume higher than you would with sealed over-ears or ANC gear. That creeping volume is a direct path to noise-induced hearing loss—far worse than any temporary soreness. So no clear winner. For ear infections, on-ears are healthier. For long listening sessions at safe volumes, over-ears with breathable fabric pads are better. The real health move? Pick whatever fits comfortably at 70 dB or lower.