The Skeptic's Journal - Absolute Self Confidence

[Shannon]

Abi, it is in fact possible to cause headaches using ultrasonic subliminals, and especially when using 5G ultrasonics, especially if the volume is too high or there is too much exposure time. Too much exposure time causes headaches by causing your brain to try too hard to get enough glucose and oxygen to keep up, and causing a pressure headache. The headaches from too high a volume and too much 5G exposure both should dissipate very rapidly when the program is turned off, usually within 5 to 7 minutes on their own.

Too much volume can also cause nausea.