It was seen landing in Alexandra Park at around 3.45pm.
A spokesman for South East Coast Ambulance Service said: “The air ambulance landed to assist us with a call to a private address.”
A spokesman for Sussex Police said: “Emergency services were called to a medical incident in Mount Pleasant Road, Hastings, at 3.11pm today.
“A man was taken to the Royal Sussex County Hospital, Brighton, by air ambulance.
“There is no further information available.”