Buddha teaches that beauty is fleeting, life is impermanent and transitory, that pain and sorrow are an outcome of the craving egotistic self. That craving is our suffering . Craving implies cravenness. To be craven is to fear. Fearfulness is suffering.
Life is fearful.
There is suffering in the world because the fearful, fearing self continues in its illusion of lonely separateness. The separate self clings to its fears, its self-seeking, its pleading, hoping, craving.