The paramedic's personal rucksack was snatched from a marked ambulance car while she was tending to a patient in Whitchurch.
She had been responding to an emergency in the St Mary's Street area between 1.40pm and 2pm on Friday when her bag was taken from the vehicle's passenger seat.
The small baby blue rucksack contained about £97, a pink leather wallet, an Apple iPhone, driving licence, a pair of glasses, bank cards and various pieces of paperwork.
Police have issued an appeal for witnesses to contact them with any information about the theft.
Richard Ewels, West Mercia Police spokesman, said: "The paramedic was dealing with an emergency patient at the time.
"While her back was turned, a thief grabbed her rucksack from inside the vehicle.
"If anyone has information to help identify the offender, please call Whitchurch police on 101 or Crimestoppers, anonymously, on 0800 555111."
Star comment: Theft from paramedic is lowest of the low