The visit to the King Hussein Cancer Centre was the final event in a busy two-day trip to the middle-eastern kingdom for the Sussexes, who travelled to learn more about the humanitarian effort to support the health and wellbeing of Syrians and Palestinians who have sought sanctuary in Jordan.
Earlier, the duke urged a group of recovered addicts to go back to their communities and help others during a tour of Jordan's National Centre for Rehabilitation of Addicts.
At the hospital Meghan rushed to the side of Huda Ramadan Alrhawjara, hugging the mother from Gaza after she described how her schoolboy son Mohammad had a recurrence of leukaemia during the recent Israeli conflict against Hamas in the Gaza Strip.
Harry quickly made friends with Sham, a 13 year-old-girl from Syria waiting for a chemotherapy session for leukaemia, and he was impressed by her English learnt through a relative, watching movies and Peppa Pig cartoons.
The 13-year-old performed a short piano piece for Sussexes and was applauded by the couple who hugged the girl before they left.
The teenager said about Harry: "He's really nice, I've heard about him, but I never thought I would meet him."
Mohammad and Sham were among a group of young Palestinians from Gaza being treated at the cancer centre and invited to meet the duke and duchess.
Mrs Alrhawjara, who was hugged again by Meghan before she left and also Harry, said: "I'm really happy that the prince and his wife are really on the side of the families, and that they came to hear our stories, it shows their humanity."
Earlier the couple described the addiction centre as "incredible" after hearing about its holistic approach to dealing with patients, providing activities like a gym and yoga classes.
After chatting to one man who was addicted to drugs but is now a mentor at the centre, Harry said: "I want you guys to know there's no shame in having an addiction, it stems from something else which is an emotional pain - you're very, very brave to come here into hospital.
"Now what you need to do is use this experience and go back into your communities and help other people who are in a similar situation."
During the visit the couple were invited to write messages of support along with a World Health Organisation delegation they were travelling with, including its director-general Dr Tedros Adhanom Ghebreyesu, who invited the couple to Jordan.
Harry's message on a sticky-note, left on a wall with others, read: "It's ok to not be ok. Trust each other.
"Congratulations on your recovery. Now share your courage and experience."
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