Video footage showed a chopper landing on Broadwater Green around 4pm on Tuesday (May 13).
Ambulances were also seen in the area.
The Air Ambulance Charity Kent Surrey Sussex (KSS) charity confirmed a helicopter was dispatched to an incident.
A KSS spokesperson said: “Our crew arrived on scene at 15:43 where they worked with SECAmb and West Sussex Fire and Rescue Service to help treat the patient, involved in a medical incident.
"The patient was then transported to hospital by road.”
1. Worthing incident
An air ambulance was seen landing on Broadwater Green Photo: Sussex News and Pictures