ATHENS — As the head of Greece’s largest oncology department, Dr. Kostas Syrigos thought he had seen everything. But nothing prepared him for Elena, an unemployed woman whose breast cancer had been diagnosed a year before she came to him.

By that time, her cancer had grown to the size of an orange and broken through the skin, leaving a wound that she was draining with paper napkins. “When we saw her we were speechless,” said Dr. Syrigos, the chief of oncology at Sotiria General Hospital in central Athens. “Everyone was crying. Things like that are described in textbooks, but you never see them because until now, anybody who got sick in this country could always get help.”

Life in Greece has been turned on its head since the debt crisis took hold. But in few areas has the change been more striking than in health care. Until recently, Greece had a typical European health system, with employers and individuals contributing to a fund that with government assistance financed universal care. People who lost their jobs received health care and unemployment benefits for a year, but were still treated by hospitals if they could not afford to pay even after the benefits expired.

Things changed in July 2011, when Greece signed a supplemental loan agreement with international lenders to ward off financial collapse. Now, as stipulated in the deal, Greeks must pay all costs out of pocket after their benefits expire.