1, Parkinson’s disease: If you are now about 50 years old, middle-aged people, while the emergence of uncontrollable shaking of one side of the hands and feet, and the shaking to the limb at rest when obvious, when the activity is reduced, then be highly alert to the possibility of Parkinson’s disease. The most typical manifestation of Parkinson’s disease is the movement of the thumb and index finger together 3-4 times per second, professionally known as “pill rolling”. The most typical manifestation of Parkinson’s disease is the movement of the thumb and index finger together 4 times per second. 3, hyperthyroidism: If you have a long history of drinking alcohol, and you are in alcohol withdrawal for active or passive reasons, you should go to the hospital for a timely serum thyroxine and thyroid ultrasound examination, because hyperthyroidism is also a common cause of limb tremors. 4, alcohol withdrawal symptoms: If you have a long history of drinking alcohol, and you are in alcohol withdrawal for active or passive reasons, then you have limb tremors at this time. The shaking tremor may be a withdrawal symptom, which is more generalized, coarser and accompanied by inattention, disorientation, mental abnormalities, hallucinations and other delusional manifestations. 5, cerebellar lesions: this type of patients can appear intentional tremor, the so-called intentional tremor refers to the patient about close to the target object whose shaking is about obvious. In addition, patients with cerebellar lesions may also have nystagmus, speech changes and ataxia such as unstable standing and walking. 6, psychogenic tremor: this kind of limb tremor tremor is mostly seen in middle-aged and elderly women, and the most distinctive feature of this kind of tremor is a kind of episodic tremor, especially after the stimulation of adverse life events, which may reduce or stop on its own after the emotions have calmed down. It should be emphasized that before diagnosing the disease, it is necessary to exclude all kinds of organic lesions caused by limb tremors. 7, drug tremor: many drugs can cause limb tremors, so before taking drugs should carefully read the drug instructions, such as the drug has caused extrapyramidal symptoms side effects should be taken in strict accordance with the requirements of the doctor, and not to increase the dosage, stop using and prolong the course of medication. If such side effects occur due to the above-mentioned circumstances, there is no need to panic, and the drug can be gradually discontinued or replaced under the guidance of a doctor, and the symptoms can mostly stop on their own.