Slight thickening of the interventricular septum is generally dangerous and can lead to sudden death, among other things. Thickening of the interventricular septum may be the result of conditions such as hypertrophic cardiomyopathy, hypertension, and restrictive cardiomyopathy. Slightly thickened interventricular septum is the result of ultrasound examination. If the patient has only slightly thickened interventricular septum, it may be caused by hypertrophic cardiomyopathy, and the patient will have symptoms such as dyspnea, chest pain, chest tightness, palpitations, etc. The patient may have complications such as atrial fibrillation and sudden cardiac death, which is a dangerous situation. If the patient’s ultrasound results have a slight thickening of the interventricular septum accompanied by myocardial hypertrophy of the posterior and anterior walls of the left ventricle, it is considered to be caused by hypertension, and the patient’s main symptoms are headache, arrhythmia, palpitations, angina pectoris and so on, and some of the patients may suffer from complications such as cerebral infarction, which is a more dangerous disease. In addition, restrictive cardiomyopathy may also lead to ultrasound findings of a slightly thickened interventricular septum, the patient’s typical symptoms of dyspnea, ascites, liver enlargement, etc., the patient may also have sudden cardiac death, thrombosis and other complications, serious life-threatening, this situation is also more dangerous. When the patient’s ultrasound results are slightly thickened septum, the phenomenon is more serious, the patient should consult a doctor in time to identify the cause of the disease, and regular follow-up.