The semi-circular line on your palm leading from above the thumb down to the wrist. In palm reading, it is generally read downwards towards the wrist. This line is not only about the subject's life span, but also about vitality, potential or past sickness, and sometimes love and affection. A long life line tends to indicate a longer life, and of it seems that a subject has two life lines this can mean added strength and resistance to illness (read the outer one as the real life line).

A mark along the life line, like an "island," a hole, or another small line crossing it can indicate periods of sickness. For example, if there is a circular blip near the beginning of your life line, it could mean that you had a period of illness or injury as a child. Also, if your life line tends to peter out near the end, it can mean sickness in your old age.