Medically, people's death is divided into several stages.

Medically, human death is divided into three stages: (1) dying stage: the main manifestations are obvious inhibition of nervous system, slow response, blurred consciousness and blurred vision, but hearing exists, body temperature drops, limbs become cold, heartbeat weakens and slows down, blood pressure drops, breathing is weak, kidneys cannot secrete urine, urine does not flow out during catheterization, and patients are in a state of dying. This period lasted for a long time.

(2) Clinical death: respiratory arrest, cardiac arrest and disappearance of nerve reflex. But some tissues and organs still have life activities. Clinical death is a reversible stage in the process of death, and there is still the possibility of resurrection.

(3) Biological death period: it is the last stage of the death process. At this time, the tissues and organs from the cerebral cortex to the whole nervous system are in an irreversible inanimate state. During this period, the whole body cannot be resurrected, which is called true death.

Therefore, doctors believe that Modada's three deaths were all fake deaths, that is, the clinical death period, which is likely to be a disorder of a certain part of the nervous system, and the specific reasons remain to be ascertained.

But the doctor's theory of "suspended animation" can't explain some phenomena of life regeneration.