Elderly NSW woman sexually assaulted

An elderly woman has been sexually assaulted after answering a knock on her door of her unit on the NSW far north coast.

Police said about 8pm (AEDT) on Wednesday the 75-year-old opened the door of her Kingscliff unit to a man who forced his way in and sexually assaulted her before fleeing.

The woman was taken to Tweed Heads Hospital for treatment.

Police have appealed for anyone who saw the man in the vicinity of Kingscliff Street about 8pm to contact them.

He is described as being of Caucasian appearance, aged in his late 30s, 180 centimetres tall with a thin build, short light-brown hair and wearing a distinctive grey-coloured Ping brand baseball cap with a white t-shirt.