There are many causes of limb tremors in the elderly, and one of the most common causes is Parkinson’s disease. Once abnormal symptoms such as hand tremors and muscle stiffness are detected, it is important to seek medical attention and take early treatment to prevent further development of the disease. Parkinson’s disease is caused by a nerve cell called substantia nigra, which regulates the brain’s motor function by synthesizing a neurotransmitter called dopamine. Dopamine is the brain’s inhibitory neurotransmitter, and is in a dynamic balance with excitatory neurotransmitters in the brain. In Parkinson’s disease, the clinical symptoms of Parkinson’s disease occur when dopamine synthesis is reduced due to the absence of nigrostriatal cells and the balance of transmitters in the brain is disrupted. The typical patient with Parkinson’s disease presents with resting tremor, muscle tonicity and reduced movement, which are the three main features of the Parkinson’s phenomenon. Non-motor symptoms, such as difficulty urinating and defecating, insomnia, depression, and reluctance to participate in social interactions, are often present in the early stages of the disease, but are not quickly brought to the attention of the patient and relatives. Therefore, when abnormal physical conditions are detected, especially in the elderly, it is important to seek early medical attention for early detection and treatment. Generally, with timely and early treatment, Parkinson’s disease can be better improved through a combination of medications, rehabilitation and other treatments. Patients with Parkinson’s disease must strictly follow the doctor’s instructions on medication. If the medication is not used correctly in accordance with the prescribed dosage or number of times, the treatment effect is very different. Some patients have not seen any change in their condition after taking the medication. If they reduce the dosage or adjust the medication on their own, they are prone to changes in their condition or side effects of the medication. Therefore, the correct use of medication is very critical. For the elderly who already have Parkinson’s disease, usually also pay attention to dietary nutrition, try to participate in some sports, adhere to the functional exercise of the joints of the limbs, which is conducive to the improvement of the patient’s motor function.