Panic, weakness and fatigue may be caused by electrolyte disorders, arrhythmia and heart failure. 1. Electrolyte disorders: For example, when hypokalemia strikes, the patient will experience weakness and fatigue, and hypokalemia may cause cardiac arrhythmias such as sinus tachycardia and premature cardiac contractions, resulting in symptoms of panic. 2. Arrhythmia: for example, supraventricular tachycardia, which is characterized by sudden onset and stopping, and panic with weakness may occur during the attack. 3. Heart failure: Partial heart failure can also cause panic and fatigue due to reduced blood flow back to the heart caused by stagnation in the circulation or pulmonary circulation. It is recommended that people with panic attacks and weakness go to regular hospitals in a timely manner to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.