According to me the reasons can be of two types:-
Personal Factors-
Inadequate market knowledge.
Low or No trading experience.
Use of high leverage on large trading volumes.
Poor trading strategies.
Normal Factors-
Big News in the market.
Change is Fiscal policy or monetary policy by the government.
Any natural disaster.
Changes in the rate of interest by the National bank. Etc.
Personal Factors-
Inadequate market knowledge.
Low or No trading experience.
Use of high leverage on large trading volumes.
Poor trading strategies.
Normal Factors-
Big News in the market.
Change is Fiscal policy or monetary policy by the government.
Any natural disaster.
Changes in the rate of interest by the National bank. Etc.