It’s caused by a loss of nerve cells in a specific part of the brain. These nerve cells are used to help send messages between the brain and the nervous system.
Parkinson’s disease symptoms tend to develop gradually, and only appear as mild at first.
But, you could be at risk of the neurodegenerative condition if you can hear some subtle changes to your voice, it’s been claimed.
People who suddenly start speaking more softly could be at risk of the brain condition, said the Mayo Clinic.
They may also start slurring their words or appear to hesitate before speaking.
You should speak to a doctor straight away if you notice any of these changes in your voice, it added.
“Parkinson’s disease signs and symptoms can be different for everyone,” said the Mayo Clinic. “Early signs may be mild and go unnoticed.
“Symptoms often begin on one side of your body and usually remain worse on that side, even after symptoms begin to affect both sides.
“Parkinson’s signs and symptoms may include speech changes.
“You may speak softly, quickly, slur or hesitate before talking.
“Your speech may be more of a monotone rather than with the usual inflections.”
Some Parkinson’s disease patients may also suddenly find it more difficult to write, or their writing may appear smaller.
Other warning signs of the condition include tremors, slow movement, and a loss of automatic movements.
They may find it difficult to make subconscious movements, including blinking, smiling, or swinging their arms when walking.
Speak to a GP if you’re worried about the signs and symptoms of Parkinson’s disease, said the NHS.
They may ask you about your symptoms, and could refer you to a specialist for further tests.
There are about 127,000 people in the UK with Parkinson’s disease – the equivalent to about one in 500 people.
Most patients begin to develop symptoms after they turn 50 years old.
Men are slightly more likely to develop the brain condition than women.