The deep lines on one side and shallow on the other side are considered to be caused by abnormal facial nerve function, improper sleeping posture and improper management of facial expression. 1. Abnormal facial nerve function: If the patient has abnormal facial nerve phenomenon, such as common facial paralysis, it can lead to the appearance of deep lines on one side and shallow on the other. Facial paralysis is mainly caused by idiopathic facial nerve paralysis, trauma, infection, tumor and vascular lesions, which can lead to the phenomena of crooked corners of the mouth, shallow nasolabial folds and drooping corners of the mouth, and so on, and therefore also lead to the appearance of deep lines on one side and shallow on the other. 2. Improper sleeping posture: if you sleep on one side for a long time, which leads to local facial extrusion, in the long run, it can lead to the phenomenon of deep lines on one side and shallow on the other side, and generally the facial lines on the extruded side are a little deeper. 3. Improper management of facial expression: usually patients like to purse their lips, hold back their laughter or squeeze their eyebrows, resulting in unilateral facial expression is too rich, can also lead to unilateral deepening of the phenomenon of the decree lines, resulting in the decree lines of one side of the deep and one side of the shallow. Asymmetric lines may also be related to development, so it is recommended that patients with this symptom should pay attention to the regular hospital in a timely manner, identify the cause of the disease under the guidance of specialists to carry out reasonable and standardized treatment.