Angelina Jolie and Brad Pitt's son was involved in a crash on Monday leaving him hospitalized.
TMZ first reported the 20-year-old crashed his e-bike into a car in Los Angeles leaving him with head injuries.
According to law enforcement, Pax rammed into the back of a vehicle as he approached a red light around rush hour.
Pax was not wearing a crash helmet at the time and an eyewitness told the outlet that he complained of head and hip pain.
Paramedics took him to hospital where they reportedly feared he had a brain bleed. But TMZ now says Pax is believed to be in stable condition.
Pax is regularly seen riding his bike around Los Angeles without a protective head gear.
In California, helmet requirements differ based on the class of the e-bike and the age of the rider. But Class 3 e-bike riders are required to wear a helmet regardless of how old they are. Pax normally rides a Talaria Sting R MX4 Electric Dirt Bike. A helmet is encouraged to reduce risk of injury.
Pax's crash comes at a tumultuous time for the family with his sister, Shiloh, currently fighting to drop "Pitt" from her surname.
The 18-year-old legally filed for the name change on her birthday this year.
She will have to wait to finalize the change due to a court postponement.
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According to Shiloh's attorney, Peter Levine, the court was unable to complete the necessary background check before the scheduled hearing, leading to the rescheduling of the hearing to August 19.
According to multiple reports, Brad no longer has a close relationship with his six children, twins, Vivienne and Knox, Shiloh, Zahara, Pax and Maddox.
Shiloh's decision to change her name seems to reflect a growing trend among her siblings.
Vivienne, 16, was recently listed as Vivienne Jolie in the Playbill for the musical The Outsiders.
Their sister Zahara, 19, officially dropped "Pitt" from her name during her induction into the Alpha Kappa Alpha Sorority at Spelman College in Atlanta last November.
Their oldest son Maddox, 22, also reportedly does not use the Pitt surname on non-legal documents, opting instead to use Jolie.