B737-800 flight attendant reported an odor that had been deemed acceptable to depart intensified lat...

Narrative:

There was an odor in the aft lavatory prior to boarding. It was inspected by the first officer and flight attendant-2 (flight attendant). First officer said we can board and takeoff with odor. In-flight the odor got strong. I; (flight attendant-2); notified captain immediately. Passengers began to complain. First officer came out of flight deck to observe smell and he could smell the odor as well. Flight attendant- 1 came to observe the smell and her eyes started burning. Captain then advised we had to divert to ZZZ. Oxygen was administered to flight attendant-2 because she was lightheaded with burning eyes and a headache. Paramedics met the aircraft in ZZZ.

Original NASA ASRS Text

Title: B737-800 Flight Attendant reported an odor that had been deemed acceptable to depart intensified later in flight; which resulted in a medical issue and a diversion.

Narrative: There was an odor in the aft lavatory prior to boarding. It was inspected by the First Officer and FA-2 (Flight Attendant). First officer said we can board and takeoff with odor. In-flight the odor got strong. I; (FA-2); notified captain immediately. Passengers began to complain. First officer came out of flight deck to observe smell and he could smell the odor as well. FA- 1 came to observe the smell and her eyes started burning. Captain then advised we had to divert to ZZZ. Oxygen was administered to FA-2 because she was lightheaded with burning eyes and a headache. Paramedics met the aircraft in ZZZ.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1649201
Time
Date	201905
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Cruise Parked
Flight Plan	IFR
Person 1
Function	Flight Attendant In Charge Flight Attendant (On Duty)
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor Flight Deck / Cabin / Aircraft Event Illness

B737-800 flight attendant reported an odor that had been deemed acceptable to depart intensified later in flight; which resulted in a medical issue and a diversion.