Tremor of the hands alone cannot be diagnosed as Parkinson’s disease, because there can be many causes of tremor of the hands. We should first understand that there are many types of tremor. According to the relationship between tremor and random movements, tremor can be divided into the following categories: resting tremor, postural tremor, intentional tremor, and other tremor. So, what causes the symptoms of tremor in both hands? What are the diseases that cause the symptoms of tremor in both hands? Resting tremor: It is a rhythmic tremor that appears at rest or in a state of muscle relaxation, generally with a frequency of mostly 4-g times/second, generally slightly slower and larger in amplitude than simple tremor, and faster and slightly smaller in amplitude than action tremor. It appears at rest and decreases or disappears with movement, and is more pronounced in the distal limbs. Resting tremor is one of the clinical manifestations of Parkinson’s disease. The resting tremor in Parkinson’s disease is often accompanied by increased muscle tone, which can be found in the examination of cogwheel-like or leadpipe-like straightening, easily detected during head and neck extension and flexion and passive movement of the elbow and wrist joints. The key reflexes may be normal, and there may be no pathological reflexes or sensory disturbances. The site of tremor involvement, frequency and amplitude of tremor are characteristic; whether the tremor affects motor function depends on the severity of the tremor. Postural tremor: tremor occurs when the body actively holds a certain posture, mostly in the distal part of the limb. Intentional tremor: Also known as motor tremor. It is a tremor that appears during random movements. It is characterized by the most pronounced tremor during random movements or when the target is about to be approached, mainly when the cerebellum and its efferent pathways are diseased. Intentional tremor can also occur without hypotonia, but only during limb movements. Other tremors: such as addictive tremors, most of them are motor tremors, but some of them are resting tremors. The tremor is mostly limited to one limb or spreads throughout the body. The amplitude varies and is often irregular. Most of them are coarse and sometimes shaking. When the patient’s attention is distracted, the tremor is often relieved; when the patient focuses on the site of the tremor, the symptoms are more aggravated. There are often psychogenic triggers or other signs of addiction.