Where it is, and what each tradition says
The upper line across the palm, starting under the little finger.
Indian tradition (Hast Samudrika): Hriday rekha is read for feelings, affection and how you show care. Where it ends, under Guru or Shani, colours the reading.
Western tradition (Cheiro): In the Western tradition it is the line of the affections and emotional style.
Where it ends
Under the index finger (Guru parvat): Your heart line reaches under the index finger (Guru parvat). Tradition reads this as idealism in love: you look for respect and shared values, and you give loyally.
Between the index and middle fingers: Your heart line ends between the index and middle fingers. Palmists read this as a balance of head and heart: warm, but with your feet on the ground.
Under the middle finger (Shani parvat): Your heart line ends under the middle finger (Shani parvat). This is read as a private, practical way of caring: you show love through actions more than words.
Curved or straight
Curves upward: It curves upward, which tradition links with open, expressive feelings.
Runs straight: It runs fairly straight, read as a calm, steady and reflective emotional style.
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Palm reading is a traditional practice, not science. Read this for reflection and fun. Please do not make health, money, marriage or life decisions from it.