Images and video shared with the YEP appear to show smoke billowing from flats above The Viaduct Showbar in Lower Briggate.
West Yorkshire Fire Service has now confirmed the source was a small fire contained inside a takeaway, but smoke had spread into nearby accommodation.
Three engines from Leeds and Hunslet stations and an aerial appliance were dispatched to the scene when an emergency call was received at around 7.35am today.
Crews reported that the fire had been put out shortly before 8.20am, with work to damp down and clear the smoke then continuing.
A spokeswoman said: "There are reports that one person has suffered smoke inhalation as a result of the fire and an ambulance was requested.
"A Fire Investigation Officer is on the scene and is looking into the cause."
Network Rail was informed as a precaution due to the proximity to the train station, she added.
For all of the latest incidents and Leeds crimes as they break, join our specialist Facebook group by clicking here.