King Pavlos began to have symptoms of illness in early 1963, he was treated for appendicitis, however it was in December 1963 when it was discovere. He suffered from constant back pain, but it was treated as problems related to muscle pain. In December, he had X-rays done, and tests to determine exactly his muscular ailments from him, it was then that the very advanced cancer was detected. King Constantine tells in his biography like the doctor visited him, his father was out of Greece, and told him the bad news, the doctor told him that King Pavlos did not have much life left. King Constantine, then Prince, called his mother who was in US . In a family meet, they communicated to King Pavlos the bad news. King Pavlos only lived two more months.
In January 1964 Princess Sofia, who on December 20 had given birth to a girl, Infanta Elena, she traveled to Greece to spend as much time as possible with her father, she took the Infanta Elena to meet him .