Electric scooters are fast becoming the hip way to get around town, but their surge has led to a major spike in injuries - particularly among young people.
Nearly a third of the patients suffered head trauma - more than twice the rate of head injuries to cyclists - probably because fewer scooter users wear helmets.
According to the new study from the University of California, San Francisco, the number of scooter-related injuries and hospital admissions soared by 222 percent between 2014 and 2018 - with a staggering 39,000 injuries recorded.
In the same period, the number of hospital admissions skyrocketed by 365 percent to a total of nearly 3,300.
Between 2014 and 2018, the number of people hurt in e-scooter pills surged by 222 percent and a third sustained head injuries because the didn't wear helmets, a new study found
About a third of the e-scooter injuries were suffered by women, and people between the ages of 18 and 34 were injured the most often for the first time in 2018.
Senior author Dr Benjamin Breyer said: 'E-scooters are a fast and convenient form of transportation and help to lessen traffic congestion, especially in dense, high-traffic areas.
'But we're very concerned about the significant increase in injuries and hospital admissions that we documented, particularly during the last year, and especially with young people, where the proportion of hospital admissions increased by 354 percent.'
The researchers had previously looked at bicycle injuries using the same data set, finding that scooter riders had a higher proportion of head injuries.
Dr Breyer added: 'There was a high proportion of people with head injuries, which can be very dangerous.
'Altogether, the near doubling of e-scooter trauma from 2017 to 2018 indicates that there should be better