Shortly before 9:00 p.m. the alarm was raised onboard Queen Victoria, around 7 miles off St Catherine's Point.
According to UK Coastguard spokesman it was believed the elderly man suffered a stroke.
He was medevaced from the liner by the coastguard helicopter and then taken to Southampton General Hospital.
Queen Victoria continued on her way to Bermuda.
For reports on cruise ship accidents see our CruiseMinus section.