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Radiation sickness

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Radiation sickness (also called acute radiation syndrome) happens when a person is exposed to large amounts of radiation all at once.

Exposure to small amounts of radiation—like from an X-ray or CT scan—doesn't cause any symptoms. But exposure to large amounts of radiation all at once—like from a nuclear accident—may cause radiation sickness and death.

Symptoms of radiation sickness may include:

  • Nausea, vomiting, and diarrhea.
  • Fever.
  • Fatigue.
  • Feeling weak, faint, or dizzy.
  • Hair loss.
  • Skin redness, itching, swelling, or burns.
  • Pain.
  • Seizures.

People who have been exposed to large amounts of radiation and have these symptoms need to see a doctor right away.

The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.