Bollywood actor Fahadh Faasil has been diagnosed with ADHD at the age of 41. At an event, he said his doctor told him it can be easily cured if diagnosed at a young age. But, what exactly is ADHD? What are the causes and symptoms of ADHD? Is it curable? Is it life threatening? Watch the video to know everything about ADHD, the disorder that many celebrities like Britney Spears, Adam Levine, Greta Gerwig, Emma Watson and more suffer from.