A study of almost 400 men found an association between cell phone use and sperm quality.
The more hours the men spent on their cell phones each day, the lower their sperm count and the greater their percentage of abnormal sperm.
The findings add to questions about the potential health effects of cell phones, which have also been linked to brain tumors and other problems.
The findings on semen samples from men who came to an infertility clinic over the course of a year. All of the men were questioned about their cell phone habits.
Men who used their phones for more than four hours each day had the lowest average sperm count and the fewest normal, viable sperm.