Fu Yin, also known as "Fu Yin," means repeating a certain image continuously, forming pairs, and symbolizing things like absence, return, etc. It is mainly used for predicting illness. The famous phrase "Fu Yin and Fan Yin cause tears to flow" refers to this concept. Fu Yin is more about symbolic expression and does not inherently indicate good or bad fortune. Fu Yin can be interpreted as worry, sorrow, pain, entanglement, staying hidden, being stuck, stagnation, and being hindered. Fu Yin also implies repetition or re-creation, indicating a new beginning.
If the year pillar and month pillar have Fu Yin, it suggests that ancestors may be declining, and one of the grandparents may have passed away when the day master was very young. Moreover, the day master may have encountered disasters during childhood.

1. If the month pillar and day pillar have Fu Yin, it indicates that after marriage, you will move out from your ancestral home. In the future, your parents may move in with you. This is where the virtue of the diviner comes into play, as many modern young people are insufficient in taking care of their elderly parents, or even neglecting them, or providing financial support but not actual care.
2. However, note that if the month pillar contains a "Bi Cai" (偏财) and it conflicts with the day pillar, then your parents will not live with you in the future. For example, if the month is Jia Xu and the day is Geng Xu, this situation would result in Jia and Geng being in a "Fan Yin" (反吟) state, making it impossible for them to live with you.
3. If the month pillar and day pillar have Fu Yin, it is not favorable for marriage. If you get married too early, there may be a second marriage. If the month stem and day stem are the same, the issue lies with the day master himself. If the month branch and day branch are the same, the problem lies with the spouse. Think about it: the day pillar represents the family, and if you go to the month pillar to establish another family, it implies having two families, which naturally causes problems in the marriage.
4. If the month pillar and day pillar have Fu Yin, pay attention to the health of the mother and spouse. Why specifically the mother and spouse? Because the month stem represents the father, while the month branch represents the mother. The day branch, on the other hand, represents the spouse. Therefore, if the month branch and day branch have Fu Yin, pay attention to the health of the mother and spouse. Similarly, if the month stem and day stem are the same, pay attention to the father and yourself. If there is illness, it usually occurs in the chest or abdominal area.
5. If the day pillar and hour pillar have Fu Yin, it is unfavorable for marriage. The logic is the same as the day-hour Fu Yin. There is a lack of emotional connection between the couple, limited communication, and persistent misunderstandings. Even if you were to marry a hundred times, the situation would remain the same, and eventually, there might even be a situation of living separately. Looking at older generations, although they did not divorce due to reputation concerns, many couples started sleeping separately after 30 or 40 years of marriage.
6. If the day and hour pillars have Fu Yin, the lifespan of the individual is generally not long, usually showing signs of death before the age of seventy. If the day branch and hour branch have Fu Yin, pay attention to the health of the spouse and children. If the day stem and hour stem have Fu Yin, pay attention to your own and children's health. Furthermore, after marriage, the children will move away from your side.
7. If the year pillar and hour pillar have Fu Yin, it is the same as the year-hour "Fan Yin." It indicates that the individual had difficulties in their early life, especially with ancestors. In ancient texts, it referred to negative effects on grandparents. If the individual experienced the loss of parents at a very young age, it is now interpreted as a conflict or harm towards elders. If the year pillar and day pillar have Fu Yin, it suggests that the child was not well-raised in early life, and it is not advisable for grandparents to raise them. They will not live in the ancestral home, and the ancestral home may change after the individual gets married.
8. If the month pillar and hour pillar have Fu Yin, it is different. In addition to the issues mentioned earlier regarding the child not being suitable to be raised by parents and diseases in the chest or lower body, there is another difference. Since the month pillar is the strongest, if the hour pillar also appears, it indicates an excessive strength of a particular element. This can sometimes be the source of both good and bad fortune. The Fu Yin of the month and hour pillars indicates an imbalance in the five elements. Pay attention to the strong elements causing misfortune. After marriage, when the individual has children, it is not advisable to entrust them to the parents for raising. Pay attention to ailments in the chest or lower body.