A handheld device for applying mechanical vibration to a body portion of an individual to treat a condition of the individual, includes: a housing; a member having an exterior surface for contacting the individual, the member configured to oscillate to apply the mechanical vibration to the body portion; and a motor in the housing, the motor configured to cause the member to oscillate at an oscillation frequency for inducing tear production or a sinus effect; wherein the handheld device has an operational sound level that is 40 dB or less.