Dui represents a marsh (the Dui hexagram), characterized by rigidity inside and softness outside. Dui signifies pleasure and shares the virtues of firmness and strength, while outwardly presenting a gentle demeanor. It upholds the righteous path, guiding people upwards.

The Dui hexagram belongs to the element of metal in the Five Elements, specifically yin metal. The symbols of the Dui hexagram include marshes, young women, shamans, speech, destruction, and severance. Dui corresponds to the lung taiyin meridian, positioned in the peripheral areas of both the pre-heaven and post-heaven Bagua, with the post-heaven Bagua specifically located in the west. It represents a secondary channel for cycling the body's channels while also generating new energy (from the periphery, drawing the energy of the heart and spleen to the kidneys, while also absorbing new energy).

Dui corresponds to the lungs, so people with a Dui constitution need to pay special attention to lung health. This is because once a person with a Dui constitution experiences lung-related issues, it is very difficult for them to recover automatically. Even if temporarily treated, these issues are likely to recur. Therefore, they should frequently consume foods that are rich in the energy of the Dui marshes for health maintenance. In the Bagua, Dui represents auspiciousness and joy. Interacting with people of this type brings happiness and joy to the heart. When two people with a Dui constitution are together, their relationship is simple and pure, without too much complexity or conflict. Optimism is the natural disposition of a Dui person.

Therefore, for Dui people, anything that brings them happiness is an excellent health practice for longevity. There is no need to force themselves to do things they don’t enjoy just because others think they should. If you and your friends are of the Dui type, avoid forcing yourselves into activities you are unwilling to do, as it may lead to emotional frustration or even physical harm.

The phrase "The lungs are associated with worry in terms of the mind" means that sadness and sorrow are more likely to harm the lungs than other emotions. The nature of a Dui person is to be happy, and anything that makes them unhappy is a great harm to their health. Factors that cause sadness or worry can have a significant impact on a Dui person's health. As a Dui person, it is important to regulate one's emotions, especially when diseases recur or are difficult to heal. It's worth considering if emotional factors are contributing to the illness. Additionally, the key acupoint for health maintenance and healing for Dui people is the Taiyuan point. For many minor issues, without the need for complex diagnosis, simply using the Taiyuan acupoint often produces excellent results.