A study shows that young people are growing horn-like bone spurs at the base of their head, and researchers believe that the appendages are a result of cellphone use.

The study examined the x-rays of 1,200 Australians between the ages of 18 and 86 and found that 40% of those aged 18 to 30 had some form of horn growth, the Washington Post reported. The study contends that the spurs are a result of shifting muscles from cellphone use. When the head is tilted forward to look at a phone, it distributes the weight from the spine to the muscles in the back of the head, resulting in bone growth in the tendons and ligaments.