In this sense all illness is a state of mind. It is an 'uprightness' of the spirit just as Edward Bach asserted in his little book 'Heal Thyself'. In any case the body is a construction of the mind, created by the mover of molecules that we call the vital force. Edward Bach 1886-1936 Infinite survival is impossible for any organism, even through mass colonisation and reproduction. Although the spirit is immortal, the body is transient and this is inevitable in the Physical universe of change and decay.
Death is inevitable.
The organisation of molecules that we call the body must eventually succumb to the dispersive forces active all the time in the mineral world. Spirit I have been guilty of jumping the gun several times in the above section by stating things about the vital force which are not immediately clear. I believe that the vital force or spirit is immortal. I believe this is a reasonable interpretation of the available evidence rather than a statement of dogma. If an absent exists that is manifestly invisible in its essence, yet which must exist on the basis of overwhelming evidence, then that agent must be nonphysical.