Stress is one of the emotion you may feel while trading.
Trading stress is stress that is caused by the act of trading. For example, the fear of losing money can place a trader under significant stress. Perversely, trading stress only compounds the original problem. For example, if a trader is having difficulty making a trade management decision, the stress that ensues will only make it harder to make the decision, and will almost guarantee that the decision is made badly.
The solution to trading stress is knowledge and experience. Knowledge gives a trader the ability to trade well, and experience gives a trader the confidence to trust in their knowledge. When a trader knows that they have the ability to be profitable, and they also have the confidence to believe in themselves, it is much easier to overcome any stressful situations that might arise.