In palmistry, the life line is the line that goes from the base of your palm, and carries over in an arc headed towards the base of the thumb. It almost looks, on most hands, as if it is encircling it. The life line may not be the line that jumps out at you most when viewing the palm of your hand, but to palmists, it just may be the single most important part of your palm. The life line represents the future health and general physical stability of the person whose palm is being read. It is the line which is indicative of how prone the person will be to illnesses and misfortunes relating to health in the future; most importantly though, the life line gives a good indication of overall lifespan.
For many readers and palm enthusiasts alike, this is why the line is so controversial, because of how much it can really say about the fate of a person. Using the lifeline, one can look at it and determine the health of the person earlier in their life, and their future health as well through many different common patterns that seem to be apparent in the majority of human hands. For example, if one has a chained or linked pattern in their life line, this usually means that the person is delicate in terms of overall health, and does not have a strong stomach. If the line is even further chained, it indicates that the person could have had bad health early in life, or can, in a more clinical sense, indicate that they've had skin disease. The length of the line also determines how long a person will live.
One thing that gives further options for readers looking to make more advanced or insightful readings involves how the life line intersects with other lines (or whether it intersects at all) and how the life line correlates with the presence of the various mounds of the palm. There are different mounds, each corresponding to a different god or symbol, and whether the life line intersects with any of these mounds or not can determine what level of success you will have in life as well. For example, the mound of Jupiter represents wealth. Therefore, if your life line does not intersect with the mound of Jupiter, it means that you will probably not make much money in life. Conversely, if the life line on your palm is shorter than average, and does intersect with the mound of Jupiter, then this means that you may live a short life, but what short life that you have will be filled with financial success. There are lots of different ways that the life line can be read, but in order to really understand it, you might need to bone up on other elements of palmistry that coincide with the reading of the life line.