Differences between left and right armpit temperatures are mainly seen for physiological reasons, such as the habit of using the hand for higher temperatures, or errors in measurement. Differences in temperature between left and right armpits are usually not considered as a disease. Within the permissible range, the difference in temperature between left and right armpits can be no more than 0.5℃, which is usually due to measurement error, either from the thermometer, or from the time of measurement, or from asymmetric placement of the thermometer, etc. The temperature of the first two measurements after exercise may be higher than the next. For example, two measurements taken after exercise can result in a higher temperature on the first occasion than on the next. Some people move their dominant hand significantly more than their non-dominant hand, which leads to more muscle development and increased blood circulation in the dominant hand, all of which can contribute to higher temperatures. When taking body temperature, you can use the practice of taking several measurements to take the average value, and try to take measurements when you are in a calm mood and the ambient temperature is suitable.