Trailing stop loss is a great feature of Forex trading. One can use it to protect profits gradually with the price movement. It helps to lock profit with every pip movement but there are its draw backs as well of which 2 are the most prominent. The first one is that you need to keep your trading terminal open in order to make this feature work. If you close your terminal, it won't work. The second drawback is that if you use a close trailing stop loss, there are chances that the stop loss gets touched with a small retracement and then you miss a huge move.