Through hand analysis, a natural practitioner will identify which organ that has problems, so they can decide what medicine/herbal you should take. They usually compare with other method (palpation, tounge, and or iridology), but for beginner, hand analysis is powerful enough.
What I meant with hand is clearly shown in the below pictures:
Below is one of the symptom we should identify wether we experience constipation or not:
"Line segment on the back of the fingers is dark. The more darker, the more serious the constipation."
You can explore the complete symptons in hand diagnose in the ebook I wrote entitle: “LOVE YOUR COLON, Do Colon Cleansing”.