Fennel is typically consumed as a dietary supplement in the form of a pill used to treat digestive problems and promote lactation in nursing mothers. The Food and Drug Administration (FDA) has not evaluated the use of fennel for medical purposes; thus, you should only use it under a doctor's supervision. Eating fresh fennel can cause common food-related allergic reactions that can cause mild to severe symptoms. If you notice any reactions while eating fresh fennel, stop eating it and call your doctor.
Immune Reaction
An allergy to fennel is the result of a mistake of the immune system. Your system mistakes the proteins in the vegetable as a dangerous substance, when it actually poses no threat. This mistake causes the body to defend itself and attacks the fennel with different chemicals, such as histamine and immunoglobulin E antibodies. Inflammation occurs in different spots, such as the sinuses, digestive system and skin, leading to allergy symptoms.
Symptoms
Additional symptoms that arise include digestive problems, respiratory complications and cardiovascular reactions. Your skin can become inflamed anywhere, causing hives, eczema or other rashes. You may develop nausea, vomiting, diarrhea, stomach pain, cramping, gas and bloating. Respiratory complications can make you short of breath, causing wheezing and coughing. You may feel your chest tighten and then have trouble breathing. Your heart can race and your blood pressure may drop, causing you to become lightheaded and dizzy.
Anaphylaxis
Anaphylaxis is a severe reaction that causes the entire body to develop symptoms that bring on a state of shock. During anaphylaxis, your face, lips or tongue can swell, your blood pressure will drop suddenly and you will feel like your throat has a lump. Symptoms can form within seconds or minutes after eating fresh fennel. You will need emergency attention and an injection of epinephrine.
Consideration
Not all adverse reactions are the result of an allergic reaction. Side effects of consuming fennel include seizures, vomiting, pulmonary edema and nausea. Allergy testing can provide information determining if you have an allergy or if your symptoms are related to another reason. Stop eating fennel until your doctor has agreed..
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