Weakness and shivering may be caused by hypoglycemia, cold, hyperthyroidism and myocardial ischemia, as follows: 1. Hypoglycemia: It may be caused by hypoglycemia, due to a long period of not eating on time, it is easy to make the blood sugar level lower than normal, which causes sympathetic excitation, resulting in a series of symptoms such as weakness of the limbs, dizziness, shivering, panic, cold sweat, etc. At this time, we should replenish energy in time to restore the body’s 2, cold: if the body is attacked by external evil, it will stimulate the body’s immune system, excitement against evil, thus putting the body in the fever stage, appearing weakness, shivering symptoms. 3, hyperthyroidism, myocardial ischemia: some patients with hyperthyroidism, due to excessive secretion of thyroid hormones in the body, will also appear weakness, shivering, should also pay attention to the presence of myocardial ischemia.