Some people say that this is a science that emerged in ancient India about 4,500 years ago. Its original intent was not to predict future, but to do hand analysis for personality assessment and counseling. Later it degenerated into future telling, fortune telling and prediction. I am not fully convinced of its scientific value and I do not believe that it can be of much use for any accurate information about a person, his or her personality and traits. The lines of hands keep changing.
Some experts say that one can see distinct changes in as little as three months.
So if they state anything they, probably, state the present condition of a person and nothing more than that. As Muslims we believe that only Allah has the full and accurate knowledge of the future. It is forbidden for Muslims to consult the future tellers or astronomers. We should not believe in their predictions. Musnad Ahmad, Hadith no. 9171.