Even though this is the most prominent symptom, some people with Parkinson’s disease never have a tremor and even those who do may not have it at the start of the condition. This can lead to delay in diagnosis and treatment. If left untreated, Parkinson's disease worsens over years. It may lead to a deterioration of all brain functions and an early death. Few other symptoms of Parkinson's disease are slowness of movement in the limbs, face, walking or overall body, stiffness in the arms, legs or trunk, trouble with balance and possible falls. Consult a doctor, immediately if you notice any of these symptoms.