Thus spoke Sri Ramana Maharshi
Owing to I-am-the-body notion, death is feared as being the loss of oneself. Birth and death pertain to the body only but they are superimposed on the Self.
Forgetfulness of your real nature is the present death; remembrance of it is the rebirth. It puts an end to successive births. Yours is the eternal life.
It is the loss of the awareness, the consciousness is feared not the loss of the diseased body.