The article offers a report relating to an allergy due to Phytolacca dioica. The section describes an infrequent case of a 40-year-old female who presented recurrent episodes of rhinoconjunctivitis related with the exposition to the pollen of Phytolacca dioica tree and sibilance episodes by night in June to July. The study suggests that pollen of Phytolacca dioica can induce immunoglobulin-E-mediated allergic responses.