In her book, The I Ching and You, Diana Ffarington Hook writes that asking questions relating to health are always difficult to answer. However she says that it is possible to diagnose correctly and that one should ask, What is Wrong? And then, What is the Cure? She says to look at what body parts the trigram refers to which will give you an idea of where the problem is or where the cure may be effected. The cause and the cure are not necessarily in the same place and that you may get an indication of the problem by studying the position of the moving line(s).
The charts below are useful for questions about health, describing the attributes associated with the lines and trigrams.