Have you ever walked into a room and instantly felt uneasy, tense, or emotionally drained for no obvious reason? Many people describe certain places as having a “haunted” or unsettling atmosphere, even when nothing visibly seems wrong. Scientists are increasingly studying a possible explanation tied to low-frequency sound waves known as infrasound, which humans often cannot consciously hear. Research suggests these vibrations may quietly influence stress hormones, mood, sleep quality, and even feelings of anxiety.
Infrasound exists all around us, produced by sources such as industrial machinery, traffic, ventilation systems, wind turbines, and even household appliances. While these frequencies sit below the normal hearing range of about 20 hertz, the body may still respond to them physiologically. Several studies have linked prolonged exposure to low-frequency noise with elevated cortisol levels, irritability, headaches, and difficulty concentrating. Experts say the effects are subtle but potentially significant, especially for people exposed for long periods in homes or workplaces.
