| Category | Symptom or sign | Brief description | References |
| Primary motor symptoms | Resting tremor | Slight tremor in the hand or foot on one side of the body | [7, 16, 17, 20, 24, 26, 32, 37] | Bradykinesia | Difficulty with repetitive movements | [17, 20, 24, 26, 32, 37] | Rigidity | Stiffness and inflexibility of the limbs, neck, and trunk | [7, 16, 17, 20, 24, 26, 37] | Postural instability | Tendency to be unstable when standing upright | [17, 24, 37] |
| Secondary motor symptoms | Freezing of gait | Hesitating before stepping and exaggerated first step | [17, 24, 32] | Micrographia | Shrinkage in handwriting | [24] | Hypomimia | Decreased expressiveness of the face | [24] | Falls | Falling due to instability | [24, 32] | Speech problem | Dysarthria, drooling, and excess saliva | [17, 24, 30, 33, 37] | Dysphagia | Difficulty in swallowing | [22, 25, 29, 30, 34] |
| Nonmotor symptoms | Cognitive disorders | Delusion, hallucination, depression, agitation, anxiety, apathy, anxiety, irritability, forgetfulness | [17, 21, 23, 24, 26, 28, 30, 32, 33] | Pain | Generalised body pains | [16, 17, 21, 24, 33] | Sleep disorder | Insomnia, interrupted sleep, excessive daytime sleepiness | [16, 17, 21, 24, 33, 37] | Autonomic dysfunction | Cardiovascular disorders | [42] | Pulmonary problems | Reduced vital capacity | [14] | Sialorrhea | Excessive salivation | [21, 34] | Mood disorder | Persistent low mood | [33, 37] | Sweating | Excessive sweating | [17, 33] | Genitourinary disorders | Urinary incontinence, urinary urgency | [21] | Gastrointestinal disorders | Constipation, indigestion, and abdominal pain | [17, 20–22, 25, 34] |
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