Emergency services are dealing with an incident below Marine Drive, about half a mile south of Douglas.
A man is at the bottom of a steep ravine and is being treated by paramedics.
Coastguards with stretchers are at the scene, but a rescue helicopter has been scrambled from RAF Valley in Anglesey.
The man appears to be sitting up, but his condition isn't known.
The alarm was raised by a friend at around 1:15pm.
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