Pia Beathe Pedersen accused her employers at the regional radio station of public broadcaster NRK of putting too much pressure on the staff.
Pedersen said in the live Saturday broadcast that she was "quitting and walking away" because she "wanted to be able to eat properly again and be able to breathe."
She ended her nearly two-minute announcement by saying there wouldn't be any news on Saturday. The disgruntled reporter had worked at NRK for 18 months. Her station covers Oslo and the Ahershus region.
NRK spokesman Oeyvind Werner Oefsti says Pedersen's actions were a surprise.