you probably mean trading requires neutral emotion ie 1. Your hands must not shake 2. Heart pumps at normal rate 3. your body temp at normal temp 4. no itchiness 5. no anger , no anxiety, no greed, just neutral 6. no smashing of computer screen 7. no dog/wife/children kicking / bashing etc etc when I first traded life, my heart pumped at 3x; damn scary. fortunately that only lasted for a week. as long as emotion is not neutral, trader wouldn't be able to make it.
its one of the main reason some traders don't hold overnight positions. and go flat end of day. for stocks especially now with this volatility. you don't want to hold any positions over the weekend or overnight. volatility is that high. if your risk is only 1% of your account, There is less stress and anxiety. You must doing no risk or low risk trading.
This is with losing money any where not just fucking trading not sure why people attribute do much more to trading profession than others that are also involved in money