Weakness and dizziness are recommended to first consult a neurologist to rule out dizziness and weakness due to posterior circulation ischemia. Next, the patient should have a routine blood test to determine if the dizziness and weakness are due to anemia. An electrocardiogram is also recommended to rule out dizziness and weakness due to myocardial infarction or cardiac arrhythmia. In myocardial infarction, dizziness and weakness are usually more common in right coronary artery stenosis and occlusion. Rapid arrhythmias can be divided into tachyarrhythmias and slow arrhythmias. The most common disease of tachyarrhythmias is atrial fibrillation, which can cause dizziness and weakness, and patients may also have palpitations and panic attacks. Slow arrhythmias can also be seen in pathological sinus node syndrome, which can be diagnosed with an electrocardiogram.