How can you tell that the cold pathogen has been expelled through sunbathing?

Back sunbathing involves exposing the back to sunlight, which can promote blood circulation, strengthen the constitution, and help expel coldness from the body. Generally, one can determine whether coldness has been expelled by observing perspiration, sensing bodily changes, observing skin changes, paying attention to mental condition, and monitoring sleep quality. However, the effectiveness of back sunbathing varies among individuals. Detailed analysis is as follows:

1. Observing perspiration: If there is significant sweating after sunbathing, and the sweat is relatively thin and clear, it may indicate that coldness is being expelled. Generally, if sweating lasts more than 15 minutes after sunbathing and the sweat is not sticky or greasy, it may suggest that coldness is being eliminated.

2. Sensing bodily changes: Feeling lighter and warmer after sunbathing, without sensations of heaviness or coldness, may also indicate expulsion of coldness. For example, improvement in originally cold hands and feet, with the body becoming warmer, is a clear sign of coldness being expelled.

3. Observing skin changes: The skin may exhibit certain changes after sunbathing, such as redness and mild warmth. If the skin previously appeared dull or pale and becomes rosy and lustrous after sunbathing, this may also indicate that coldness is being expelled.

4. Paying attention to mental condition: Feeling refreshed and experiencing reduced fatigue after sunbathing indicates that internal coldness has been partially dispelled. Reduction of coldness helps improve circulation of blood and qi, thereby invigorating the spirit.

5. Observing sleep quality: Improved sleep quality at night without significant cold sensations or nocturnal sweating after sunbathing indicates that the body's yin-yang balance has been adjusted and the effect of expelling coldness is evident.

During back sunbathing, it is important to choose appropriate times and locations, avoid prolonged exposure to intense sunlight, and take sun protection measures. Additionally,保暖 (keep warm) and hydration are necessary after sunbathing, avoiding immediately entering an air-conditioned room or consuming cold beverages.