A bushwalker is fighting for life after being rescued off a mountain near the Sunshine Coast.

The man was walking the summit track on Mount Ngungun, in the Glasshouse Mountains, when he suffered an unknown medical incident about 10.30am on Tuesday.

Fire and rescue crews helped paramedics get the man off the mountain.

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Queensland ambulance said the man was found several hundred metres into bushland in a life-threatening condition.

He was taken to Sunshine Coast University Hospital just before midday.

The Mount Ngungun trail is considered a moderate, grade 4 hiking trail that can take several hours to complete.

The summit offers views of Mount Tibrogargan, Mount Coonowrin and Mount Beerwah.