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A study suggests that high-frequency sounds generated by door sensors, public address systems and machinery could give some people seasickness-like symptoms.

People with symptoms such as headaches, dizziness and migraine are being sent away unheeded by doctors, scientists and manufacturers, said Timothy Leighton, professor of Ultrasonics and Underwater Acoustics at the University of Southampton, and author of the study.

"I don鈥檛 like the assumption that if you can鈥檛 hear it, it can鈥檛 harm you because we don鈥檛 have a mechanism to say that", Professor Leighton said.