Do hands and feet curl and become stiff?
Image Credit; Michael J Fox Foundation
Yes it’s a symptom of the disease and it’s called Dystonia.
Dystonia is a movement disorder in which a person's muscles contract uncontrollably. The contraction causes the affected body part to twist involuntarily, resulting in repetitive movements or abnormal postures. Dystonia can affect one muscle, a muscle group, or the entire body.
Read more from the Michael J Fox Foundation on Dystonia