 What's up everybody? Welcome back to Psych2Go. My name is Daria and today we're going to be talking about depression and five facts on it. Number one, fuzzy diagnosis. Diagnosing someone with depression is a tricky thing because most of the symptoms can be caused by multiple things. According to the DSMV criteria, depression can be diagnosed if five or more of the following symptoms last for more than two weeks. Some of the symptoms are suicidal thoughts, emptiness, irritability, lack of interest and pleasure, feeling guilty and not worthy enough and so on and so forth. Number two, causes through experiences. The causes of depression vary drastically from person to person. In some instances, depression is genetic. In other instances, depression is a valid reaction to any upsetting life event. Death, redirection, illness, any major life change can be the catalyst for insunfortune with disorder. Number three, causes through neurophysiology. The most popular theory suggests that depression is a lack of serotonin flowing throughout the brain. Other evidence suggests that depression could also be a result of malformations in subcritical structures such as the hippocampus, thalamus and the basal ganglia. Number four, problematic internet usage. Problematic internet usage and depression are highly correlated. Problematic internet is defined as internet that is risky, excessive or impulsive nature leading to adverse life consequences. Excessive internet usage is a symptom of depression but it cannot be said yet that internet is the cause of depression. And number five, seasonal depression. Though individuals are prone to becoming depressed in the winter, there exists no conclusive evidence and the literature to suggest that the atmosphere and condition are the cause of the phenomena. Contemporary reasoning says that we get vitamin D from absorbing sunlight. Vitamin D is thought to be positively correlated with serotonin, thus a lack of sunlight specifically in the winter, maybe the cause of these pattern deflated moods. And that's all we got for today's video. Make sure you give it a big thumbs up, comment below what you think, subscribe, and don't forget to check out my channel where I make videos every single Thursday and I'll see you guys next time. Bye! We'll work closer into details of what's going on.