The left side of the face sags more than the right side of the face, and the common causes are loss of collagen, partial chewing, and facial nerve palsy. Treatment can be given by injecting collagen, adjusting the habit of chewing, and taking oral nerve-nourishing drugs. 1. Loss of collagen: The loss of collagen in the face is more serious, which will lead to sagging of the face, and the sagging problem can be improved by collagen injection and facelift surgery. 2. Partial chewing: half of the face sagging and partial chewing has a certain relationship, often chewing on the right side, can lead to the left side of the face than the right side of the face sagging serious, can be adjusted to chewing habits, more with the left side of the chewing. 3. Facial nerve palsy: Mostly due to bacterial, fungal and viral infections leading to facial nerve damage. The patient may have facial expression muscle paralysis, such as the left side of the face looks more droopy than the right side of the face, and the corners of the mouth are crooked and so on. Nutritional nerve medications such as methylcobalamin, vitamin B1, vitamin B6, etc. can be used. If the left side of the face looks more droopy than the right side, it is necessary to go to the hospital for consultation and targeted treatment after clarifying the cause.