A state prosecutor says the co-pilot with a history of depression who crashed a Germanwings airliner into the French Alps had reached out to dozens of doctors before the disaster.
The revelation suggests Andreas Lubitz was seeking advice about an undisclosed ailment.
Marseille prosecutor Brice Robin would not address the question of what symptoms Lubitz was assessing.
Mr Robin is leading a criminal investigation into the March 24 crash that killed all 150 people on board Germanwings Flight 9525. Investigators say Lubitz intentionally destroyed the plane.
Mr Robin said he will discuss the investigation with victims' relatives in Paris next week and address efforts to reduce delays in handing over remains.