Some Ki work positively, while others work negatively on the individual. Just as trees can not grow under large trees that block sunlight, when parents are too great, it may be difficult for the child to follow suit.
Illness is the same, in that there is always a cause.
One such cause could be the living condition. Originally, humans possessed thorough knowlege of how to live peacefully with one's environment, and such knowlege has been handed down from generation to generation. However with the economic expantion, such wisdom has been abandoned and fire, light, water, earth, which had been long revered by the people since ancient times have continued to be polluted. Humans have chosen to create the current illness-stricken environment, and are investing their money in medical treatment. Manami will probe into the cause of the illness, together with the patient.