By Alan Mozes

THURSDAY, Feb. 23, 2017 (HealthDay News) -- A large new analysis suggests there may some type of link between and the risk for .

However, the study can't prove that one condition causes the other -- or even which direction the link might travel, the researchers said.

For example, maybe Parkinson's somehow raises a person's odds for ischemic -- the type that's caused by a clot and makes up the vast majority of strokes. Or, it could be that having a stroke weakens the brain, raising the risk that a patient will develop Parkinson's.

Or, as one expert who reviewed the findings said, a separate, unknown factor might independently link the two conditions.

"There may be some processes that occur with aging that increase the risk of both and neurodegenerative disorders" such as Parkinson's, said Dr. Andrew Feigin, a neurologist at Northwell Health's Neuroscience Institute in Manhasset, N.Y.