What do vertical lines on the heart line mean?

Short answer: Vertical lines on the heart line can point to upward emotional movement, support, hope or creative partnership energy. Read them by direction: a clean line rising from the heart line is different from a mark that cuts through or breaks it.

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Read my palm
A close view of the middle of a palm, with the three long creases easy to see

What this means

First confirm whether the mark rises from the heart line toward the fingers or cuts across it from another direction.

Then check whether the main heart line stays clear, deep and continuous around the mark.

Use it as a clue about emotional expression or relationship energy, not as a fixed prediction about one person or event.