The former Hampshire, Middlesex and England spinner is currently a month into treatment.
The 50-year-old took to social media to announce the news regarding his health.
But Udal is determined to fight the disease with ‘every breath in his body.’
In a Twitter post, he wrote: ‘Just 2 clarify & get it out in the open after lots of rumours & questions – yes I have been diagnosed with Parkinson’s disease.
‘I’m a month in 2 treatment, which I’m hoping will do the trick & calm the shaking arm & other problems down.
‘There’s always someone worse off, thx #allgood.
‘Thanks for the messages re-Parkinson’s, very much appreciated and I will fight it with every breath in my body #nevergivein.’
Udal started his career at Hampshire, spending 18 years with the county.
The 50-year-old also featured for England, making four Test and 10 ODI appearances.
Udal finished his first-class career at Middlesex before retiring in 2010.