What does it mean when someone tells you someone died in your dream?

Answer 1

It is impossible to suggest a meaningful interpretation of this dream without more information about the dream itself. In general, in dreams, death is a metaphor for change. See the attached link for further information.

Answer 2

they will die too if you think about it?

Generally speaking, the first answer is perfectly correct: people die every day as a fact of life. But this particular dream probably concerns a specific person who was known to the dreamer before death, and suggests that someone else in the dreamer's circle of family or friends will die in the near future. Such dreams are common, especially among young people who have not experienced the loss of friends and family before. The dream is not a reliable prediction of any future event. Rather, it represents the mind's effort to cope with the reality of death and what it means to the dreamer. Ultimately, the subconscious mind must grapple with the reality of one's own eventual death; such struggles are normal and necessary elements of moving toward maturity.