My child’s autism symptoms have returned. What should I do?

If a child is doing well but prior symptoms seem to be returning. I first always look for external forms of stress such as infections (sinus, middle ear) or pain (dental problems, cramping), or emotional trauma (change in home or school, shifts in the family dynamic). If there are no apparent causes here and the return of symptoms is lasting more than 1-2 months, then I consider focusing on improving intestinal bacterial balance by shifting to rifaximin or increasing the frequency I use rifaximin.