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Nausea and vomitingNausea and vomiting are typically the earliest symptoms of radiation sickness. The higher the dose of radiation, the sooner these symptoms appear - and the worse the prognosis. Someone who starts to vomit within one hour of exposure is likely to die.
Sometimes people with radiation sickness feel bad at first and then start to feel better. But often new, more serious symptoms appear within hours, days, or even a few weeks of this "latent" stage.
Spontaneous bleedingRadiation sickness can cause bleeding from the nose, mouth, gums, and rectum. It can cause people to bruise easily and to bleed internally as well - and even to vomit blood.
The problems occur because radiation depletes the body of platelets, the cellular fragments in the blood that are form clots to control bleeding.