The causes of under-eye bags in 40-year-old men are mainly caused by bad lifestyle habits, genetic factors, age factors, and disease factors. Eye bags, also known as lid bags, mostly occur in the lower eyelid, is due to eyelid skin relaxation, orbicularis oculi muscle is too thick and the accumulation of fat globules in the orbital septum, forming a local bag-like bulge in the eyelid area. 1, bad habits: may be due to long working hours, use of electronic products, etc., which leads to the endocrine system in the body dysregulation, poor blood circulation in the eyes, followed by the symptoms of eye bags; 2, genetic Factors: if parents have bags under the eyes, then the offspring will also have the possibility of inheritance; 3, age factors: with the growth of age, the body gradually lose water, collagen and other substances, the skin becomes loose, followed by the symptoms of bags under the eyes; 4, disease factors: such as kidney disease will lead to the retention of water and sodium in the whole body, the symptoms of bags under the eyes will appear. Therefore, if the bags under the eyes do not affect normal life, you can do without special treatment. If the bags under the eyes are more obvious, affecting normal life, or accompanied by other uncomfortable symptoms, it is recommended to go to the hospital in a timely manner, after a clear diagnosis for symptomatic treatment.