The broadcaster, 52, has been absent from the show since losing her voice at last Tuesday's National Television Awards.
Explaining her croaky voice to co-host Ed Balls, she explained: 'I felt like I'd been vaping. I sounded like I'd been smoking 20 a day. It's so frustrating.
'I think I sound like Holly [Willoughby] you know she's got that little catch in her voice, which is so appealing. But about two days ago, I sounded like I had Holly but with bronchitis.
'I had no voice at all on Saturday night and I don't really understand what's gone wrong. I felt mildly ill, nothing you wouldn't work through. If everyone stayed off when they had the mild sniffles then work wouldn't get done.'
Oh dear: Susanna Reid made her grand return to Good Morning Britain on Tuesday after vocal chord issues left her sounding like she 'smoked 20 cigarettes a day'
Susanna said: 'I think I sound like Holly [Willoughby] you know she's got that little catch in her voice, which is so appealing. But about two days ago, I sounded like I had Holly but with bronchitis' (Holly pictured on Thursday)
Susanna was forced to see a specialist after her symptoms persisted, who was able to shed some light on why she wasn't recovering.
She explained: 'Funny enough, last week, I joked with Laura [Tobin] that it was about the hot weather, and all the climate trolls came out and said I can't believe you're taking it that far.
'Actually, I saw a specialist yesterday who said that maybe because of the hot weather, I didn't stay hydrated enough.'
Yet while the specialist was able to offer some advice to get her back to good health, Susanna confessed the guidance has made her life 'less enjoyable.'
She revealed: 'I've got to switch my normal coffee for a peppermint tea, so life's become a little less enjoyable for me and everyone around me.
'As you may have realised in the meeting Ed, because me without coffee at five in the morning is a different beast!'
Ed quipped in response: 'You were on a scale of your normal grumpiness, you were slightly more grumpy than usual but it was within a range that was both manageable and discernible.'
Grand return: Susanna was back in the hot seat alongside co-host Ed Balls who joked that she was grumpy now that she was following doctor's orders to avoid coffee
The night before: The broadcaster, 52, has been absent from the show since losing her voice at last Tuesday's National Television Awards (pictured on the red carpet)
Sharing an update on her Instagram page on Sunday evening, the presenter revealed she would not be on screens on Monday as she follows advice from a specialist.
'Sorry not to see you tomorrow. Back in full voice v soon I hope, thanks to specialist treatment and your brilliant tips,' Susanna wrote.
She later shared a video to her Stories, with her voice clearly affected by the 'mild infection'.
'Quick update of my voice which as you can hear is not one hundred percent. I feel absolutely fine,' she told her followers.
'But the specialist that I saw on Friday said not to risk it until it is better. Thank you for everyone at GMB for stepping in and to all of you for all of your brilliant tips.'
'I have been steaming and also doing honey and lemon and turmeric and ginger tea and drinking tons and tons of water, I will see you soon.'
Susanna was replaced on Good Morning Britain at the last minute for Wednesday's show - after losing her voice at the NTAs.
Charlotte Hawkins stepped in at the final second for the presenter, 52, as she took to the helm with co-host Ed Balls.
The change was announced at the start of the show as Charlotte said: 'Good morning to you, this is a bit of an unscheduled appearance for me this morning!'
Ed explained that he had even seen Susanna that morning as she prepped in her dressing room and so was equally shocked by the change.
He said: 'I was about to say, you know, I came into the studio as usual about 4:30am. Walked past Susanna Reid's dressing room.
'There was Susanna, as always, in her white dressing gown, getting ready for the show to come. This feels like a bit of a change!'
Charlotte - who was also at the NTAs - went on to say: 'The reason is because you saw Susanna there, but we couldn't hear her because she has unfortunately lost her voice.
'She is here in the building with us. Here she is, Susanna, how are you?'
A poorly-sounding Susanna, explained: 'I'm fine, I just can't speak! I don't know whether it was the heat, inflaming my vocal cords.
Replaced: Charlotte Hawkins stepped in at the final minute for presenter last week as she took to the helm with co-host Ed Balls
'It's funny because of course it was the NTAs last night and when I got my cab to leave, the driver said: 'You're the very first person to leave the NTAs, you're obviously not partying'.
'Of course, I don't drink, I don't smoke, so there's no reason I can understand why I've completely lost my voice.'
Charlotte replied: 'The irony of it, we were all there together last night. You left first, you hadn't been drinking anything, I didn't leave as early as I should have done.'
Susanna continued: 'I'm really sorry, I can only apologise, but thank you Charlotte for stepping in! I didn't want to inflict this on our wonderful viewers for a whole three hours.'