The reality star and A&E doctor, 28, spoke to the ITV morning show about the experiences of front line NHS staff.
He told presenters Adil Ray and Ranvir Singh that people need to take the pandemic "seriously" because some people suffering from the virus are having to use ventilators.
Dr Alex said: "Patients who are becoming very unwell are requiring a lot of help and support.
"And we're seeing that number grow. Please take it seriously, especially when it comes to our advice when comes to self-isolation, not going to pubs, clubs and bars.
"It really makes a difference and ultimately, will save lives."
Dr Alex is a doctor at University Hospital Lewisham hospital in London.
This comes as 20,000 troops are readying to step into the capital as it faces a total lockdown as early as Friday.
The death toll from coronavirus has now reached 104 in the UK with confirmed cases up to 2,226.
Dr Alex appeared on the ITV2 dating show in 2018.
Fans loved the unlucky-in-love doctor as he bumbled through the show, but eventually hooked up with Alexandra Cane.
However, he attracted the ire of viewers after getting cold feet and calling it off – saying he wasn't feeling their relationship anymore.
He told The Sun Online about his experiences in the hospital yesterday: "In our A&E department, we only have one isolation room for infectious diseases, with one bed, not the 15 or 20 beds you might imagine.
"If numbers rise, we would have to quarantine whole wards."
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