Drowning is a form of death caused by being suffocated with water or another liquid.Near drowning is the survival of a drowning event where the person is unconsciousness (passed out) or breathes in a dangerously large amount of water, and can cause serious problems, including death, later on. That means that near drowning also requires help from a doctor.
Secondary drowning is death caused by chemical or biological changes in the lungs after a near drowning incident.