Which of the following is NOT a secondary symptom of Parkinson's disease?

In the context of Parkinson's disease, tremors are a primary motor symptom rather than a secondary symptom. Primary symptoms are those directly associated with the neurodegenerative process affecting the brain's ability to control movement, including tremors, rigidity, and bradykinesia (slowness of movement).

On the other hand, constipation, dehydration, and weight loss are considered secondary symptoms of Parkinson's disease. These symptoms often arise as complications of the disease or as side effects of medications used to manage its primary symptoms. For example, constipation can result from reduced physical activity and changes in diet, while dehydration may occur due to difficulty in swallowing or reduced fluid intake. Weight loss may occur due to a combination of factors such as altered metabolism, difficulties in eating, or decreased appetite.

Understanding the distinction between primary and secondary symptoms in Parkinson's disease is crucial for effective management and treatment approaches in individuals living with this condition.