The woman, in her 20s, was treated in hospital after she was found in a park on Haywards Heath on Sunday.
The incident happened around 9:30 p.m. in Victoria Park, near South Road.
Sussex Police said her injuries were not life-threatening.
Officials have launched an investigation to clarify the exact circumstances surrounding the situation.
Anyone who has seen anything suspicious in the area at this time is asked to contact Sussex Police online or via 101 quoting serial number 1171 dated 27/11.
https://www.theargus.co.uk/news/23156090.woman-found-head-injuries-haywards-heath-park/?ref=rss Woman found with head injuries in Haywards Heath Park