From a metaphysical perspective, many modern diseases and personality traits may originate from past lives, especially certain "incurable illnesses" that could be related to karmic debts, which can be glimpsed through destiny analysis.

According to Zi Wei Dou Shu (Purple Star Astrology), if the Fortune Palace has a transformation of Ji (化忌), it indicates that some "欠债" (debts or deficiencies) from a previous life have carried over into this one, manifesting as great psychological pressure or a tendency to develop depression, anxiety, and other modern mental illnesses.
From the Eight Characters (Ba Zi), for example, if the fetal element Wood overcomes the Four Pillars' Earth, it suggests weak spleen and stomach functions. If the Five Elements are偏枯 (imbalanced or deficient) or繁荣 (flourishing), and the chart contains "刑" (punishment or conflict), it often corresponds to chronic diseases or immune system disorders that are difficult to cure with modern medicine.
Knowing one's destiny is for "shifting the nature." If you realize that your irritability or certain psychological illnesses stem from conflicts or karmic debts in your chart or past life karma, this awareness itself begins to dissolve karma. If there is a "causal disease," it is advisable to do more charity, donate medicine, and practice generosity—such as giving wealth or Dharma offerings. These acts help eliminate karma and serve as compensation.
Next, one can use Feng Shui tools to harmonize the destiny chart. This is the meaning of fortune-telling: to seek good fortune, avoid misfortune, guide life, and adjust one’s fate.