Bolton’s League One clash with Cheltenham was abandoned after 29 minutes due to a medical emergency in the crowd.
Referee Sunny Singh Gill took the players off the field just after 3.30pm as medical staff went to help the supporter.
The match was officially abandoned 30 minutes later.
Bolton said the fan had suffered a suspected cardiac arrest and was taken to hospital.
A club statement read: “A supporter in the East Stand suffered a suspected cardiac arrest around 30 minutes into the game at the Toughsheet Community Stadium.
“The man was treated by medical staff and paramedics at the scene, while the two teams were taken off the pitch.
“Following sustained attempts to revive the patient, he was taken to the first-aid room at the stadium and the match was abandoned shortly after 4pm.
“The supporter was subsequently taken to hospital and the thoughts of everyone at Bolton Wanderers are with him and his family.
“An update on the supporter’s condition will follow.
“Details regarding a new date and ticket refunds/arrangements for the fixture will be released in due course.”
Cheltenham added: “Today’s fixture against Bolton Wanderers has been abandoned due to a medical emergency in the crowd.
“The thoughts of everyone at Cheltenham Town Football Club are with the individual involved and their loved ones at this time.”
The game was still goalless when play was halted. Kyle Dempsey had fired over for Bolton at one end while Cheltenham’s George Lloyd was denied by home goalkeeper Nathan Baxter.
Bolton ended the day still two points off the top of the table after leaders Portsmouth suffered a surprise home defeat, while Cheltenham remained three points from safety.