This just in: Daniel Radcliffe suffers from “cluster headaches”.
According to PerthNow:
The condition causes intense pain on one side of the head and is experienced by just one per cent of the population.
“I was in the middle of these weird things called ‘cluster headaches’. It’s very rare evidently, but it’s exceptionally painful. It makes a migraine look quite tame,” Radcliffe said.
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