Tremors are one of the most distinct symptoms of Parkinson’s disease. They usually start off in the hands, spread to other limbs, and affect your writing abilities. But this isn’t the only symptom that comes with this disease. Having bradykinesia or hypokinesia, gate and balance problems, and non-motor issues like loss of smell, sleep apnea, constipation, memory loss, and difficulty multitasking can be signs of Parkinson's disease.