In a foreign horror film, this man always feels a pain in his neck. Later, he photographed the ghost riding around his neck with his camera. At the end of the film, the man was ill.

I watched a Thai horror film called Ghost. The hero is a photographer. When she was studying, her girlfriend was caught and raped, and then the man was still there to help take pictures. Later, this woman committed suicide. Revenge on him. In one scene, he always felt his neck ache. When he went to weigh himself, he gained a lot of weight, but his appearance remained unchanged. It's the female ghost who has been riding around his neck.

Later, the United States (I don't remember which country) also made a ghost film with the same plot, called "Confinement".

You can search and see if it's the one you said.