Day after day, Catholics return from sobering hospital visits and type these terms into online search programs -- "cancer" and "patron saint."

This leads them to St. Peregrine Laziosi, a 13th century Italian monk who spent his life serving the sick and destitute. Biographers note that, at age 60, he was mysteriously cured of a gangrenous growth on his right leg.

With additional computer-mouse clicks, cancer patients find prayers like this: "St. Peregrine, whom Holy Mother Church has declared patron of those suffering from cancer, I confidently turn to you for help in my present sickness. I beg your kind intercession. Ask God to relieve me of this sickness, if it be his Holy Will."

Members of ancient Christian churches grow up knowing about their own patron saints, as well as saints linked to their parishes. It's natural for Catholics to identify with saints -- like St. Patrick in Ireland -- linked to their homelands.

But there are times in life when it's natural for believers to seek "companion" saints to enter their prayer lives, said Father James Martin, author of "My Life with the Saints," a commentary on the role of saints first published in 2006.

"Even if you have no pre-existing ties to St. Peregrine, you are going to pray to him for his intercessions when you learn that you have cancer," said Martin. "That's just one of the many ways we get connected to saints at different times in our lives. Sometimes these connections are logical and sometimes they are mysterious. … 

"I tell people that when they find themselves being drawn to a particular saint, it's probably because that saint is already praying for them. In the end, this is all about the Holy Spirit and God's providence."

 It's hard to say why some saints are more popular or famous than others. The Catholic website Aleteia ("truth" or "disclosure" in Greek) recently published a feature entitled, "The top 12 saints according to Google searches."

The top online saint was St. Vincent de Paul of France, which could indicate that many people were looking for St. Vincent de Paul thrift stores.