United Kingdom, July 24 -- David Harbour feared his mental health issues were related to his money troubles.

The Stranger Things star has opened up about his long-running battle with mental illness and revealed he previously thought his issues were down to his financial problems and the instability of a career in acting - until he started making good money as a castmember of the hit Netflix show and his problems continued.

David told The Hollywood Reporter: "I wonder about mental illness sometimes, whether it's an actual disease, as they say, or whether it's a recidivist condition like homelessness or something .

"It comes with certain components that feel like a disease, for sure - I still think I'm mentally ill even though I have mor...