Parkinson's Disease Symptoms and Diagnosis

I've been noticing slight tremors, some speech difficulties and stiffness in my 72-year-old dad. Could these symptoms be related to Parkinson's disease? How is it diagnosed?

The most common signs of Parkinson's Disease include tremor, slowed movements (perhaps observed as stiffness), and unstable gait. So this is possible with your father. Speech difficulty, however, is less common and may suggest the presence of another neurological condition that may look like Parkinson's Disease.

It is best to have him seen by a neurologist for a thorough history, examination and appropriate blood testing and imaging.