Apologies for this but if you can't ask on here then where can you ... How do you know if your child has threadworms? My dd aged 4 woke up last night crying and saying that her bottom was itchy and today said that it was still itchy. I had a look but couldn't see anything. I'm reluctant to give her the worm medicine unless I'm sure that's what it is, as I seem to remember from childhood that it's quite unpleasant to take. Any advice? TIA