As for me, I made my biggest loss in Forex trading when i just started trading Forex. Funny enough, i made my biggest loss immediately after making my biggest profit. It was due to my attempt to take advantage of an immediate reversal of trend.
This eventually turned out to be a trend continuation that was even far more powerful than the previous one and because i didn't cut my losses, it made a record breaking loss.
what is your biggest lose, and what was the cause?