Panic and fatigue are non-specific symptoms. Many diseases and causes may lead to panic and fatigue, for example, panic and fatigue may easily appear under the condition of exertion; also, during the upper respiratory tract infection, patients may have panic and fatigue due to the attack of bacterial toxins on the body. In addition to the symptoms of dizziness and headache, patients may also suffer from panic and fatigue. The heart is the main organ for pumping blood, which can lead to panic, palpitations, hand tremors, and weakness, usually due to arrhythmia, such as frequent premature ventricular beats or atrial fibrillation. Hyperthyroidism, with high serum thyroxine as well as high T3 and T4, can also cause panic and weakness in patients.