How many minutes should you hold the thermometer when taking your temperature for a cold?

When taking a thermometer reading under the armpit (axillary temperature measurement) during a cold, the thermometer should be held in place for 5–10 minutes to accurately reflect the body's true temperature. Axillary temperature measurement is safe and convenient, making it a commonly used method during colds. Proper technique is essential to avoid inaccurate results. If body temperature remains above 38.5°C, or is accompanied by severe headache or difficulty breathing, prompt medical attention is recommended.

Axillary temperature reflects the thermal equilibrium between the body surface and deep tissues. The skin under the armpit is close to blood vessels, allowing indirect estimation of core body temperature. If the thermometer is held for too short a time, heat may not be fully conducted, leading to an underestimated reading that fails to reflect actual fever levels. Five minutes is the minimum duration required for adequate heat exchange.

Before measuring, dry the armpit thoroughly and place the mercury tip of the thermometer firmly against the skin, holding the upper arm tightly to prevent movement or contact with clothing. If experiencing chills during a cold, wait until the body is stable before taking a measurement. If the first reading appears abnormal, repeat the measurement after 15–30 minutes and use the average of the two readings to improve accuracy.

During a cold, it's best to measure body temperature at consistent times each day, such as upon waking, in the afternoon, or before bedtime. After each use, clean the thermometer promptly and store it in a dry place. When feverish, drink plenty of warm water to stay hydrated, avoid excessive bundling or aggressive cooling measures, and adjust clothing appropriately based on body temperature to support recovery.