17-year-old hand tremor caused by many reasons, as follows: 1, hyperthyroidism: is the most common cause of teenage hand tremor, this disease will also be accompanied by panic, palpitations, emaciation, can be clarified through the thyroid function test. 2, anxiety, tension: if long-term anxiety, tension, there will be a hand tremor, especially now that teenagers are relatively late at night, the situation is also prone to hand tremor, anxiety, tension. 3, idiopathic tremor: this disease generally has a clear family history, but there are also some disseminated patients. The first thing you need to do is to get rid of the anxiety and tension. 3, idiopathic tremor: this disease usually has a clear family history, but of course there are also some patients who emanate. Whether it is a long-term hand tremor, or a recent hand tremor, it is recommended to go to the hospital to clarify the cause, according to the cause to be symptomatic treatment.