In rare cases, people may have severe allergic reactions characterized by difficulty in breathing, dizziness, rapid heart rate, nausea, or vomiting. However, these symptoms are not common with Japanese carpenter ants' bites. It's important to note that the severity of the symptoms can vary depending on the individual's sensitivity and the number of bites or stings received. If you are concerned about a specific bite or sting or if symptoms persist or worsen, it is recommended to consult a healthcare professional for proper evaluation and treatment.