What is the cause of suffering?
All suffering is created by the mind, by thoughts. The mind labels sensations as 'bad' or 'wrong' or it shouldn't be happening. This is fighting what is occurring in the Now. It is bringing in narratives which are simply not even happening. The dentist example in this video.
The mind paints over the purity of the present moment with thoughts. We have the power to bring in presence to the thoughts which occur. We can choose to interact with them and accept them. Or let them pass by. We can either see and watch thoughts occurring, or we can believe and get hooked into what thoughts are being offered and allow them to cloud our sense of reality.
When we are believing our thoughts, most of the time, we are then living in an obstructed sense of reality. Listening to thoughts can drive us into a deeper sense of separation, of an individual self, and therefor enhance the suffering.
Make a commitment to be present. To be aware of what the mind is saying, and see you are not that.
When suffering is occurring, begin to ask, who is the one suffering? What decision or judgement have I made about simply 'what is'?