Commercial Fixed Wing
Flight Attendant Current
Other / Unknown
Flight Deck / Cabin / Aircraft Event Illness / Injury
General None Reported / Taken
Environment - Non Weather Related; Human Factors
While in flight there was a medical emergency.  Aft FA had just finished with trash pick up; passenger pressed her FA call button. FWD FA went to check and passenger explained she can not breathe and she feels like she was going to pass out. I opened the air vents fully and asked if it was any better; passenger said no; she still can't breathe. I didn't offer water because there was a full bottle on passenger tray table; so I told the passenger to take a drink to see if would help. Passenger then stated she need O2. I told the passenger we have O2 on board; but I have to let the PIC know I'm using it. I called the flight deck told the PIC the situation and he stated I should let him know how the passenger feels after O2 was administered. I asked the passenger if she has emphysema; to which she said no. I also asked passenger if she would like for the aircraft to make an emergency landing and get medics. Passenger said no she was feeling better with the O2. I secured the O2 bottle in the seat next to passenger and told her to press her FA button if she need anything else or if O2 runs out and she needed more. The AFT FA checked on the passenger on her trash run. PIC called to ensure passenger didn't need medical attention once we land which the passenger declined; as the O2 had her feeling better. Passenger stated she was wearing her mask all morning in the airport and stated that could have been her reason for not being able to breathe.
Flight Attendant reported a passenger could not breathe; so oxygen was administered until passenger felt well.