An intensive care consultant told BBC Breakfast viewers she is caring for "young fit and well" patients who are "probably going to die" as a result of coronavirus.
Dr Ami Jones, who works at Royal Gwent hospital in Wales, said people are ding with only nurses to hold their hands as family cannot be at their bedside.
She works in the hospital's intensive care unit (ITU), having previously been on yours to Afghanistan.
The army reservist said: "They are dying with nurses holding their hands."
Dr Jones added that the department, which is in the high-coronavirus-cases stricken Aneurin Bevan Healthboard, has doubled its ITU capacity and was filled with: "Mainly young (people), much younger than I thought.
"You may think you're young fit and well and it's not going to affect you, but I've got young fit and well patients in my ITU that are probably going to die. We've never seen so many sick patients."
She said many of her patients were in their thirties and forties, Wales Online reports.
"It's very difficult to look at someone who could be you in a hospital bed, it makes you feel very mortal."
Dr Jones heartbreakingly admitted that 50% of those who came into the ITU they wouldn't be able to save.
Those patients being treated for Covid-19 are also not allowed any visitors.
"We try and do voice calls/video calls," added Dr Jones. "(But) most of them are asleep on a ventilator.
"They are dying with the nurses holding their hands."
She praised her fellow NHS staff while admitting that the current situation was taking its toll on her colleagues.
"It's really tough, it's taking an emotional toll on them.
"We almost feel like we are in it by ourselves. We know it's our job and people will keep their heads high and keep going out their doors every day."
Adding to the end of her interview the doctor reiterated the advice to stay home to prevent the spread of the virus.
"I can't see a worse situation to put yourself in when you have a choice to not make that happen - just stay at home."
