Suffering
Suffering (Sanskrit: duḥkha) is the first of the four truths of the noble ones taught by the Buddha in his first teaching. It is the pain that accompanies birth, growing old, falling sick, and dying. It also includes the suffering of meeting the unpleasant and parting from the pleasant. Not finding what is being sought is also suffering. In short the five perpetuating aggregates are suffering. This is what we call suffering. (Lalitavistara Sutra)
In the above reference, eight types of suffering are identified; namely, the sufferings of:
(1) birth,
(2) old age,
(3) sickness,
(4) death,
(5) meeting what is unpleasant,
(6) parting from what is pleasant,
(7) not finding what is being sought, and
(8) the five aggregates.
The noble eightfold path, which is part of the truth of the path, is taught as an antidote to these eight types of suffering.
These eight types of sufferings can also be condensed into three:
(1) Suffering of suffering
(2) Suffering of change
(3) All-pervasive suffering of conditioning
Source: https://www.rigpawiki.org/index.php?title=Suffering
Insight into the First Noble Truth: To overcome dissatisfaction and suffering, it is essential that we understand and accept the ever-changing, impermanent nature of life; we acknowledge the presence of dissatisfaction and suffering; we understand the very nature of suffering, and we embrace suffering compassionately, without fear or avoidance. (From The Heart of Dharma Collection)