(TMZ) - Honey Boo Boo's sister Pumpkin has been rushed back to the ER after complications from a serious car accident last month ... TMZ has learned.

13-year-old Pumpkin was taken to a Georgia hospital last night -- and sources tell TMZ, it's because she's still experiencing serious pain in the wake of the January 6th car accident that injured several members of her family.

TMZ reports Pumpkin has been complaining of bad headaches, neck pain, and nausea -- all signs of head trauma. A rep for TLC tells TMZ, she was admitted to the hospital for a battery of tests.

As TMZ reported, Honey Boo Boo, Mama June, Pumpkin and Jessica were all passengers in the car, which was driven by Sugar Bear. Police later determined Sugar Bear was at fault.

Photo Credit Splash News