, July 7 -- Many people worry about the mental effects of spending hours on phones and other digital devices, but experts say the physical impact may be just as important. From neck pain and weaker hands to vision problems and skin irritation, growing evidence suggests heavy technology use can gradually affect the body in ways many people do not notice.

One visible sign for some users is a small callus on the finger used to support a phone. However, researchers say the effects may extend much further, potentially altering posture, weakening muscles, reducing motor skills and even contributing to long-term health problems.

'Tech neck' and spinal strain

Looking down at a phone for long periods can lead to a condition commonly known as "t...