This is an excellent question that comes up frequently. You most likely have pollen food allergy syndrome (PFAS). It is also called oral allergy syndrome (OAS). It is an allergic reaction. Your reactions are not consistent with a food intolerance.
OAS typically happens when a patient, who is allergic to pollen (e.g., birch, alder, ragweed, mugwort, and some grasses), eats certain foods. This includes fresh fruits, vegetables, nuts, and grains. The symptoms are limited to the mouth and throat. They include:
- Scratchy throat
- Itchiness of the mouth or lips
- Swollen lips, tongue, or throat
Patients allergic to birch pollen can have OAS with:
- Many other foods
The treatment is to avoid foods that cause these symptoms. It may also help to treat the birch allergy and nasal allergies with allergy shots (immunotherapy). If this treatment is successful, approximately 50% of patients see an improvement in their OAS. They are able to eat the foods that triggered it.