It depends on the severity of the depression, but people who are depressed can struggle to get out of bed, shower, eat, or brush their teeth. Many things that

It depends on the severity of the depression, but people who are depressed can struggle to get out of bed, shower, eat, or brush their teeth. Many things that non-depressed people find easy are excruciatingly difficult for depressed people. Just picking up the phone and calling someone might be a struggle. Then there's the problem that many activities that might have seemed interesting and fun to do while the person was not depressed often seem uninteresting or meaningless when they are depressed. Finally, there's all the self-recrimination and self-loathing that comes from knowing you could "easily" have done all sorts of things to make your life better and reach out to people but just not done them, which spirals people even further in to depression. It's a really tough cycle to break.