1) A big loss which threatens our existance as a trader. This gives a big shock and one sincerely feels something is wrong totally. This is like a major illness needing immediate action or a surgery.
2) Small losses every month which accumalate into a big loss. This is more dangerous as this is like silent killer ailment which show no visible sign and trader keeps consoling himself that all is not wrong...it is only some errors this time...else he will be ok soon....This false sense of wellbeing leads to major losses and loss of confidence to win...that is still worse.