A320
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Deck / Cabin / Aircraft Event Illness / Injury; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
General Flight Cancelled / Delayed; General Maintenance Action; General Physical Injury / Incapacitation
Aircraft
We were operating as (flight) from ZZZ1-ZZZ. While on descent into ZZZ through approximately 18;000 feet we noticed an odor once we entered visible moisture. The odor persisted while on descent but once we were out of the visible moisture; the odor lessened.   Upon arrival to the gate and after engine shutdown; one of the aft Flight Attendants called to report that the odor was very strong in the aft of the aircraft.   A logbook entry was made and Maintenance was called. I also spoke with the [Duty Manager] and made a report to him regarding the cabin odor.   After the aircraft was deplaned; the flight attendants and I felt some symptoms and we spoke with Medlink. After conferring with Medlink; we decided to go to the hospital for evaluation and treatment. During cruise; we had a Lavatory Smoke warning which only lasted a few seconds. The flight attendants performed an inspection of all three lavatories and found no evidence of smoke or fumes in any of the lavatories.
[Report narrative added no additional information.]
A320 flight crew reported a fume event during arrival descent. Entire flight crew received medical evaluation and treatment at local hospital.