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Radiation sickness was an illness caused by exposure to excess radiation. Coughing was one of the first signs of the illness. (AUDIO: Protect and Survive) According to Ram Singh, its symptoms were "agony, followed by death". Matteusz Andrzejewski agreed. (TV: Detained)

When the First Doctor, Susan Foreman and Ian Chesterton discovered, through the use of a Geiger counter, that there was excess radiation on Skaro, they deduced that it was causing radiation sickness. In that particular case, the effects of the disease included a jungle being turned to stone, soil becoming barren, and a feeling of sickness between the three. (TV: "The Survivors")

On Oseidon, the Fourth Doctor and Sarah Jane Smith speculated that the soldier they saw going over a cliff was suffering from radiation sickness. (TV: The Android Invasion)

On Terminus, Bor suffered from radiation sickness. (TV: Terminus)

The Tenth Doctor intentionally gave himself radiation poisoning to save Wilfred Mott, causing him to regenerate into the Eleventh Doctor. (TV: The End of Time)

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