By 
Helen M. Farrell
 | 
TED-Ed Original

What is depression?

Depression is the leading cause of disability in the world; in the United States, close to ten percent of adults struggle with the disease. But because it's a mental illness, it can be a lot harder to understand than, say, high cholesterol. Helen M. Farrell examines the symptoms and treatments of depression, and gives some tips for how you might help a friend who is suffering. [Directed by Artrake Studio, narrated by Addison Anderson].

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