Margin call can be a painful experience for forex traders as it means they have insufficient funds to cover their trading positions. It may result in forced liquidation of their positions, which can lead to significant losses. Traders can avoid margin calls by practicing sound risk management techniques, such as setting stop-loss orders and using appropriate leverage. It's important to monitor account balances regularly and maintain adequate margin levels to avoid margin calls. By being cautious and disciplined in their approach, traders can minimize the risk of margin calls and protect their trading capital.