It’s particularly important if your child is an asthma sufferer as they often experience more severe allergic reactions. Go to your GP and get an allergy test if you’re at all concerned.
If your child is diagnosed with an allergy you will find out exactly what is causing their symptoms. Your doctor will then be able to give you specific advice on how to manage the allergy e.g. what food to avoid.
It will also mean that you don’t have lots of appointments and unnecessary treatments because you know the cause of their problem.
If your child doesn’t have an allergy then their symptoms can be treated and investigated further. They can also eat any foods that may have been restricted.
[NICE] National Institute for Health and Clinical Excellence. Food allergy in children and young people (CG116). 2011. London: National Institute for Health and Clinical Excellence.