Parkinson's disease in its early stages may primarily manifest as clumsiness in limb movement, especially in fine motor skills, such as difficulty in wrapping dumplings, rolling dumpling wrappers, or slow buttoning, which are clinical signs of early symptoms. Some patients may initially experience slight trembling in the limbs, which is generally more pronounced during rest and relaxation and diminishes during activity. Additionally, some individuals with early Parkinson's disease primarily exhibit non-motor symptoms, such as constipation, depression, reduced sense of smell, and may also experience rapid eye movement sleep behavior disorder, characterized by shouting and physical actions like punching or kicking during sleep.