Which condition is classified as a chronic nervous disease?

Parkinson's disease is classified as a chronic nervous disease because it is a progressive neurological disorder that affects movement. It is characterized by the degeneration of neurons in a specific area of the brain known as the substantia nigra, which leads to a deficiency of dopamine, a neurotransmitter essential for coordinating smooth and controlled movements. Over time, individuals with Parkinson's experience symptoms such as tremors, stiffness, difficulty with balance, and changes in speech and writing.

This condition often requires long-term management and can significantly impact daily functioning and quality of life, highlighting its chronic nature. Additionally, Parkinson's disease has a well-defined set of motor and non-motor symptoms, further solidifying its classification as a chronic nervous disease.

Other conditions listed, while they may involve neurological aspects, do not fit the definition of a chronic nervous disease in the same way that Parkinson's does. Sun-downing is a phenomenon related to confusion in dementia patients, aphasia is a language disorder typically caused by brain damage, and senile dementia refers to a decline in cognitive function but is not categorized specifically as a chronic nervous disease like Parkinson's.