Lingual hematoma is a rare but potentially fatal cause of upper airway obstruction, and is mostly associated with either trauma or hematological disease such as elevated prothrombin time. We report a pregnant woman with lingual hematoma due to traumatic kissing associated with idiopathic thrombocytopenic purpura (ITP). A review of the literature indicated that most previous reports showed trauma and anticoagulants with warfarin, heparin, or tissue plasminogen activators to be the most common causes of lingual hematoma. This is, to the best of our knowledge, the first report of lingual hematoma secondary to traumatic kissing. Otolaryngologists and anesthesia staff must thus be aware of this complication due to the possibility of fatal posttrauma hemorrhage.