What do you mean, there is an backstabbing in fortune telling?

What does the fortune teller mean when he says I have hidden diseases? Please kindly help explain, thank you very much!

Eight defeats is a hidden disease. It just means that you were born in a bad month. Let me show you, plus heavenly stems and earthly branches's five elements of yin and yang. In the month, you may not be able to do anything with your parents, and you may have external diseases. It is unscientific to only look at the time of year, month and day and tell fortune. I hope I can help you.