###Human: Is it normal for facial muscles to change shape when I am under stress? ###Assistant: Hello. It is very strange if your facial muscles tend to change shape on daily basis. I know of a few conditions in which facial flushing (redness) can occur due to increased blood flow, but the change in facial musculature with food intake or under stress is not a common thing. The facial flushing can occur with eating of certain foods which are rich in amines. Can also occur with hyperthyroidism and diseases like VIPoma or some other carcinoid syndrome. But the above things also have certain other presenting features.