Radiation name itself explains the sickness caused due to the radiation over dose. Especially large doses in short period of time,which is know as acute radiation syndrome it can alsbe known as radiation poisoning.
Common exposures to low-dose radiation, such as X-ray or CT examinations, don't cause radiation sickness.
The initial signs and symptoms of treatable radiation sickness are usually nausea and vomiting. The amount of time between exposure and when these symptoms develop is an indicator of how much radiation a person has absorbed.
The treatment goals for radiation sickness are to prevent further radioactive contamination; treat life-threatening injuries, such as from burns and trauma; reduce symptoms; and manage pain.