15 Celebs Who Are Struggling with Severe illnesses

2. Daniel Radcliffe – Cluster Headaches

Daniel Radcliffe recently revealed that he has something in common with his Harry Potter persona, which is that he suffers from severe headaches. Cluster headaches are a type of chronic headache that is among the most painful, and it happens in episodes. A person can get several attacks in one day during a cluster period, and these typically occur at the same time of day. So while they are very painful, they can at least be predicted.