Manual transmission makes noise when under load going forward. Not in neutral. on 1999 Nissan Altima

It has gotten louder in the last couple of days.

Asked by for the 1999 Nissan Altima
Check the transmission for oil or perhaps just change the oil as a precaution. If it makes noise in all gears and not in neutral or the clutch pedal depressed the bearings in the transmission may be bad requiring the transmission to be overhauled.