Parkinson’s disease
According to Henry W. Wright
The author calls these observations a preliminary study.
In his preliminary discussion, Wright lists unresolved rejection, a sense of abandonment and deferred hope, as well as a possible personal or generational background.
Prolonged rejection and disappointed expectation may reinforce the belief that important desires will never be fulfilled and the future will no longer bring anything good.
Wright links this state to hopelessness and a weakened belief in the possibility of a new beginning.
A person may continually return to past failures, mistakes and unfulfilled expectations instead of leaving them behind and beginning to expect good again.
Wright associates deferred hope and hopelessness with reduced dopamine levels, describing dopamine as a neurotransmitter connected with pleasure and anticipation.
In his model, dopamine deficiency is then linked to tremor and other Parkinson's symptoms.
Spiritual response
Leaving past failures behind, receiving God's mercy, renewing desires and hope, and planning and expecting good again.
Sources
Henry W. Wright — A More Excellent Way (2009, English), p. 269; topic: Parkinson's disease
The author's preliminary discussion
A More Excellent Way — https://resources.beinhealth.com/products/amew
The 8 Rs to Freedom — https://www.beinhealth.com/8-rs-to-freedom/