Constantly Thinking Disorder: is it a real thing?

Maybe... If you can't seem to look it up or get a 100% answer, you could try talking to your doctor...

Some people have a lot of trouble to "disconnect". Their brains seem to always be engaged to an idea or particular situation. Meditation can help quiet things in your mind a little, as well as listening to music or focusing on simple tasks like coloring or making lists.

Depends on the definition. There is anxiety, which can cause overthinking and such which is not good.

There are certainly disorders that involve over thinking things, although which one you may have would depend upon other symptoms. Often disorders such as OCD and anxiety involve over thinking things, or attempting to analyze them.

It's not a disorder or at least it's not defined as one. It's more like when a person is unable to stop thinking and can't possibly have a calm state of mind. Can be considered as a symptom of ADD or ADHD. More like a hyperactive brain receiving too much energy and working too hard so that the person is more likely and is more often mentally and emotionally exhausted. People use extensive methods to keep a control of their minds, from alcohol and drugs to meditation and music. It's definitely a real thing and people do get affected by it but I don't think we can go as far as to say that it's a disorder. PS: I have it.

Well, as living humans, we are bound to think constantly otherwise there would be a problem haha! We cannot turn off our brains and just have peace and quiet... even when we sleep, we are thinking! We tend to think a lot when we are under stress or when we are bored and devoid of mental stimulation. I am not sure what it would mean in the context of a disorder, but I am sure some people are more prone to rumination and excessive dwelling on certain thoughts.

Well... Yes and no. By itself, I don't believe that is a real disorder, no. However, constantly thinking can be attributed to various other things - ADHD for example. The people on 7cups can't help diagnose you as (most) of us aren't trained professionals, however if this is an issue that is bothering you and causing distress, it may be worth mentioning to a therapist who could help you find out what's causing it.

With my limited knowledge and not being a doctor, I believe so - and I too suffer from it, the brain not wanting to just shut up.

No! Every living human being is constantly thinking, so by definition it is not a disorder. However, when we become stuck in ruminative thoughts that trigger chronically negative mood states, this can lead to a particular type of suffering that we could choose to label as a disorder. But constantly thinking is not a problem in and of itself.

Stress causes over thinking. It can be carried from childhood. Concerns about anything and everything that worry a person. The only relief may be when all is going well. Even then some may worry that this will not continue. I consider it to be a learned habit especially if constant calamities in life have burdened a person. They learn to expect setbacks, let downs and upsets and their brain cannot rest easy even at night their dreams or nightmares may be trying to find an answer to their constant concerns and fears.