Do people on the autistic spectrum have trouble smiling and showing facial emotions?

Often: People with autistic spectrum problems have difficulties taking in cues from their environment, interpreting this information, and then responding in a way that is "on target" for the situation. In addition, there is often a lack of emotional response, or an inappropriate emotional response, to the environment. This can lead to an outward appearance of unusual emotional responses.

Yes: Difficulties with social interactions/relationships is common across all levels of functioning. It ranges from the obvious in those who are non verbal and completely in their own world to those who are engaged with others but have trouble with the subtleties of human interactions. They may not understand facial cues of other, be able to read body language and take all comments as literal.