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However, this range decreases with age, with most adults being unable to hear above 16 kHz. The human ears are capable of hearing sounds with frequencies as low as 20 Hz all the way up to 20,000 Hz (20 kHz).

The true identity of this mystery is sounds you don't hear. Since the time the motor was replaced, the headache, sleeplessness, and other stress-related problems of the old woman was gone just like bad spirits melted with heavenly fire. What was bothering him during his nap was the noise from the well pump motor, which is on almost the whole day to give water to their vegetable plantation. He asked a well pump technician nearby to check and replace it. He searched and inspected every corner of the warehouse when something caught his eyes. He noticed something different when he entered the old warehouse. He went around the house including their old warehouse just beside their house. He stood up and tried to find out what is making him feel unusual and uneasy. The son immediately noticed the problem of his mother when he also felt something different during his nap. One day, her eldest son came to their place to visit her. Doctors could not find any illness out of the complaints from the elderly woman. There was a case where an old woman was suffering from stress, headache, and sleeplessness.

After the World War II, many popular magazines around the world started to publish strange maladies caused by sounds you don't hear. Sounds you don't hear make you sick.this is nothing new at all.