We all know that some people always seems to be sad but there can be  many psychological and non - psychological reasons for that….Lets discuss it one by one

Probably, they can see the things in a different manner which you don’t. And then they think that they’ll never be able to communicate with other people with their this uncommon perception towards things.

Generally, people those are sad have a hole within them.  It is all about loss against your wishes/dreams which you want it back.

 People feel that it is the only  way to overcome the inner sadness of them by way of being chronically sad, disturbed, distracted and ignorant towards everything.  Extreme consequences of sadness can result to person drawing himself towards Alcohol, Drugs or some other addiction.

While, some people are genetically programmed to be miserable. Environment affects their emotions or mood by altering their biochemistry. If the chemicals are fucked up genetically, whatever they do, y will be sad.  Feeling sad isn’t at all unusual. Because human being is an emotional being and sorrow is a normal human response to any disappointment or loss.  The factors, like genetics, that you don’t have control over. However, there are others, such as your diet, that can be modified. While making a change won't necessarily prevent depression, it may help reduce your risk.   Whether you can change them or not, it's helpful to be aware of factors that could make you more likely to develop depression in your lifetime. 

One of the more well-studied depression risk factors is trauma in early childhood. Bad Childhood Experiences are a big reason of depression in later life and also known to increase a person’s lifetime risk of developing both mental and chronic physical illness. 

Sadness is a temporary state that must have a clear cause, like any kind of disappointment or bad news from someone etc This type of sadness can fluctuate throughout the day. In response to that person can might cry often, feel drained, and struggle to focus /concentrate

You never have to cope with emotional problems on your own. Not knowing what’s making you feel so crap makes it hard to find a reliable solution. A counsellor can help you figure out what’s going on, guide you through strategies to overcome your sadness, and recognise if something more serious is going on.