Quo star in throat cancer scare.
Doctors discovered a growth when the 57-year-old rocker went for a check-up after he had struggled with his voice on the band's current tour.
He was referred for "urgent" treatment by specialists as the band was forced to cancel the rest of its scheduled performances.
In a statement issued on the official Status Quo website, band manager Simon Porter said: "Rick saw consultant Stephen Toynton, an ear, nose and throat surgeon at the Nuffield Hospital in Plymouth, who has expressed concern with a growth in Rick's larynx.
He has recommended that it requires urgent investigation. Consequently all nine shows on the current sell out UK tour have been cancelled."
Mr Porter also told The Mirror that it was feared that Parfitt had a malignant tumour.
"We will not know for certain until the exploratory operation next week but we fear it is probably malignant," he said.
"Everyone is devastated and is hoping the best for Rick and his wife Patty.
"It's come at the worst possible time, just before Christmas, and in the middle of a sell-out tour, which the boys were enjoying every second."
In 1997, Parfitt had a quadruple heart bypass after doctors said he could die at any time following a hard-living lifestyle involving drink and drugs.
The cancelled shows will be not be rescheduled and tickets holders are being offered refunds.