It is completely up to you whether you tell someone you meet that you have autism.
You might think it is a good idea to tell them if it is someone who is important to you or if you think it will help them understand you better.
If you need to tell someone who you don’t know that you have autism, it can be a good idea to carry an Autism Alert card, available from the National Autistic Society.
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The NAS offers excellent advice on telling people about your autism.
For details of the NAS Autism Alert Card.