Emergency services responded to an incident on Marine Parade Worthing this mrning.
The KSS Air ambulance, Sussex Police, SECAam, and WSFRS all attended.
The Air Ambulance landed nearby on the beach.
A Police Spokesperson said a 42-Year-old man has been arrested and taken into custody.
A Spokesperson for West Sussex Fire Service said “At 10.57am this morning we were called to support SECAmb with a medical incident on Marine Parade, Worthing. We left the scene at 12.49pm.”