If i am allergic to celery am i allergic to fennel?

Likely: Since the most common issue with celery is related to pollen-food allergy syndrome, I will assume it is the case here. Allergic sensitivity is cross-reactive between Birch family of pollens (or mugwart/grss) and foods including celery and fennel (and others in apiaciae family like carrot). Patients may not have symptoms with all foods in the family, but would be expected to have symptoms with 2-3