What are the side effects of fennel?

What are the possible side effects of fennel ()? Although rare, allergic reactions to fennel may occur. Stop taking fennel and seek emergency medical attention if you experience symptoms of a serious allergic reaction including difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives.Rash and increased sensitivity of the skin to sunlight has also been reported with the use of fennel. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.