ECG p-wave widening is due to left atrial enlargement or atrioventricular block. Normal adult ECG p-wave width is 0.06 to 0.12, and more than 0.12 is considered p-wave widening. The causes of p-wave widening are commonly found in the following conditions: 1. Heart valve disease: for example, mitral valve stenosis or closure insufficiency can cause atrial thickening, often with ECG p-wave widening, which needs to be diagnosed through detailed measurements of cardiac ultrasound and treated for the cause. 2. Hypertension: Long-term elevated blood pressure and poor control can reduce the function of the left ventricle, leading to increased pressure in the left atrium, resulting in left atrial enlargement and p-wave widening. Patients with hypertension need to take medication on time, such as nifedipine extended-release tablets, metoprolol tartrate tablets and so on, to make the blood pressure control standards. 3. Atrioventricular block: p-wave widening can occur due to delayed electrophysiologic conduction in the atria and intra-atrial block, which does not require treatment if there are no symptoms. Therefore, for ECG p-wave widening, we should find out the cause, if it is caused by organic heart disease, we should actively treat the primary disease, and if there is no organic heart disease, we don’t need to deal with it, and we can review it regularly.