A man from Falmouth was diagnosed with a brain tumour after drinking 10 litres of water a day for two years.

Doctors initially thought Jonathan Plummer, 41, had diabetes, but appointments with his GP and a kidney specialist resulted in inconclusive test results.

It wasn't until a routine eye test revealed a mass, he was referred to Derriford Hospital for an MRI scan, and diagnosed with a brain tumour.

It was on his pituitary gland, which impacts water retention. The postman underwent 30 rounds of intense radiotherapy.

Now cancer-free, Jonathan remains on life-long medication but has remained positive and even did a sponsored skydive where he raised £385 for Brain Tumour Research.

Jonathan from Falmouth, Cornwall, 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 and had steroid therapy which caused him to gain four stone - going from 12st to 18st.

Jonathan said: "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."

Mel Tiley, community development manager at the charity, said: "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."