There are more reasons for a line under the eyes, which may be normal physiological tear trough or eye bags caused by eye fatigue and lack of sleep. Under normal circumstances, the tear trough under the eyes can be manifested as a more obvious line, the development of the tear trough is a physiological situation, usually no obvious eye discomfort. Different degrees of development of the tear trough ligament can lead to a certain degree of individual differences in the depth of the tear trough, in some people may be more pronounced tear trough, and along with the age of the bags under the eyes of the relaxation, will aggravate the degree of pronounced tear trough. Patients with obvious bags under the eyes can also appear similar performance, bags under the eyes with heredity, age and other factors. In addition, patients who stay up late for a long time and use their eyes tiredly will have edema under the eyes, which is more obvious. It is recommended that patients with linear changes under the eyes accompanied by other discomforts seek prompt medical attention to evaluate their condition and follow the doctor’s instructions for treatment.