Doctors initially thought a man who drunk 10 litres of water a day had diabetes.
However, the reality was much worse for Jonathan Plummer, 41, as it turned out he actually had a brain tumour.
Appointments with his GP and a kidney specialist initially resulted in inconclusive test results.
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It wasn't until a routine eye test revealed a mass that Jonathan was referred to Derriford Hospital for an MRI scan. It was here that he was diagnosed with the brain tumour.
The tumour was on his pituitary gland, which impacts water retention.
Postman Jonathan underwent 30 rounds of intense radiotherapy and is thankfully now cancer-free. He does remain on life-long medication, however.
Jonathan, from Falmouth, Cornwall, is now doing a sponsored skydive to raise money for Brain Tumour Research.
He said: “I felt a constant thirst that I couldn’t quench and got to the point where I was passing as much water as I was drinking.
"It was an awful time which caused me to miss days of work at a time and I experienced extreme fatigue.
"I was devastated. The tumour was growing on my pituitary gland – which was causing my need to drink water all the time – and many other ‘spots’ on my brain.
"An operation wasn’t an option so I was placed on steroids to help with the pressure of the tumour in my brain.”
He was diagnosed with a germ cell tumour in 2002.
Jonathan had steroid therapy which caused him to gain four stone – going from 12st to 18st.
He added: “I was always very active and played rugby and cricket weekly which is something I have never been able to return to.
"I took up running and swimming as non-contact exercise and have regained control of my weight.”
Jonathan has so far raised £380 ahead of the Jump For Hope at Perranporth Airfield in Cornwall.
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Mel Tiley, community development manager at the charity, added: “We’re grateful to Jonathan for sharing his story and it’s wonderful to hear how he has found positivity after his brain tumour diagnosis.
“His story reminds us that brain tumours are indiscriminate; they can affect anyone at any age.
"We’re determined to change this but it’s only by working together that we will be able to improve treatment options for patients and, ultimately, find a cure.”
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