To suffer is something that we don't want to wish. Believe it or not we will suffer sometimes.
They are many types of suffering as you know. But for me I just simplify it to 4 types only. Physical, emotion, mentally and finally the one that people nowadays forgotten which is the most important it's the spirit.
When a person suffer, it comes with a package. Example, people involved with an accidents. He will be suffering from physical such as wound, emotion such as regret and mental such as nightmares. In spirit there will be feeling loss disconnected to GOD. Other example, if you shouted by your boss the effect will be the same but it start from your emotion and spread to your physical, mental and spirit.
What is the force that creating this? It's the negative energy. It attack these 4 bodies also. But the most destructive is the negative energy in spirit form such as unclean spirit, fallen angels, demon and whatever written in bible. That is why we should guard our spirit by keeping our physical, emotion and mental clean. That why we have religion and belief. It guard us well, if we fall we are going to suffer. Suffering cause by spirit level is far more destructive than you can imagine. It will destroy our soul and perish. We will live soulless.
My next question is how do we handle suffering? Simple.. Be strong. Never say or even think that at the time we suffer we blaming GOD. GOD never let us suffer for he sent his son to suffer for us because of our sins. GOD only have one pure energy that is HIS language. It's unconditional love. Love without term and agreement, non selective that why it's pure, border less, unrestrained..
There is reason why we suffer. There is only one. It's our own negligence and naive ness that cause our own suffering. That the law of cause of effect. You break you pay dearly.
The good thing about suffering is, it makes us realize there is mistake we made in the past. We can't fix it but we can accept it. It's not easy but eventually we will be a victor. Acceptance with an open heart will help us and elevate our spiritual consciousness even more. That is our purpose in life to attain highest spiritual level and reunite with our creator... Amen.