Emergency services have been called to a rural village.
Police officers as well as fire personnel and ambulance crews are on site at the incident in Nepcote Lane in Findon.
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Multiple crews can be seen stood at the scene as part of a multi-agency response.
A Sussex Police spokesman said: "Officers are currently on scene in Nepcote Lane, Findon, after responding to concerns for the welfare of a man around 11.25am today.
"Whilst the investigation is ongoing, a cordon has been put in place as a safety precaution and there may be a small amount of disruption to residents in the immediate vicinity.
"There is not thought to be any wider risk to the public.
"A multi-agency response will be present in the area for some time and we are grateful for the public’s patience and understanding while this is ongoing."
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