If a person is allergic to one type of insect bite/sting then there is an increased likelihood that they would be allergic to others. The same applies with nuts,if you are allergic to one type of nut then you will more than likely be allergic to all or most of them.An allergy to nuts does not necessarily mean you are more likely to be allergic to seafood though. You can be tested for allergies but I would advise getting a doctor to do it and avoid the home testing kits as they regularly give false positives,as do the ones used in health food shops.