Clinical psychologist Dr. Emma Cotterill explains what depression is and what causes it, offering practical advice for those helping loved ones navigate through the condition, whether or not it is diagnosed.

As of 2021, the World Health Organization reported that more than 264 million people worldwide live with depression. But depression doesn't only impact those who suffer from it.

This common mental health condition takes a toll on partners, family, friends, coworkers, and acquaintances who find themselves trying to help, often without the necessary tools.

Dr. Emma Cotterill is a UK-based clinical psychologist with a background in mental health and neuropsychology. In her 2023 book, How to Help Someone with Depression, she outlines the condition and gives guidance to those who find themselves in supportive roles.