Droning noise under hood

[Roadqueen#1]

I have a 2005 Odyssey with 188,000 miles on it. Within the last six months a droning noise or loud hum has developed under the hood. It is audible only when in motion, and the greater the speed, the greater the noise. Thoughts?

[lothian]

Any possibility of posting a recording of the sound (either as a file attachment here, or a link to a YouTube upload).

That said...
Based entirely on your concise description of the symptoms, I speculate the possibility of a failing wheel bearing. Happened on my '05 (driver's side). A non-dealer Honda-specific shop charged ~$150 to replace.

[Davidjaime]

You can immediately think of the dead bearings, perhaps you need to immediately bring the car to a prestigious garage to handle immediately.
In addition, the cause may be due to deflection drive belts or fan drive belts. The noise emitted under the engine cover may be due to a worn or damaged drive, while the type noise may be caused by the inoperative EGR valve, the engine overheating, carbon accumulation in the combustion chamber ...