Larry Mullen Jr. has always found it difficult to comprehend arithmetic, and now he knows why. After years of struggling with numeracy skills such as adding and counting, the U2 drummer, 63, has been diagnosed with Dyscalculia, a learning disability that makes it difficult to understand numbers and do math.

Drummer Larry Mullen Jr., a founding member of Irish rock band U2, has revealed that he has a learning difficulty that makes counting musical bars feel like climbing Mount Everest.

Larry Mullen Jr., has revealed a surprising health diagnosis, and it explains why he looks "pained" while drumming.