For me the life line is one of the three major lines (the other two are head line and heart line) in palm reading. It starts from the palm edge between the thumb and forefinger and extends to the base of the thumb. Most of the people may think the line is used to see the length of one's life. In fact, it mainly reflects a person's physical vitality and life energy. Also, it shows if one will have accidents or serious illnesses during the whole life.
For example: If you don´t have a long and deep life line and other lines of your palm are clear, it's not a good sign. It indicates a poor health and a short life. You are easy to get sick or have accidents during the whole life.However if you have a secondary line running parallel with the life line, it shows you have a very strong vitality. Especially, you have a strong resistance to disease and self recovery ability after illness. In addition, you usually can receive additional strength and support from family members.