How do you know if you have anxiety?

If you worry over a small problem, or the small problem is massive to you and you can't let go of it. If you obsess over something, can't let it drop. Run short of breath when panicking, chest pain, feel like you're having a heart attack. Tingling in an arm. The systems effect people differently, mainly stressing over something and you can't relax or feel like you're going insane in a stressful situation. That feeling of angst in the pit of your stomach, a nasty build up.

Anxiety depends on the person and can change from one person to another. However common signs are extreme nerves, the feeling that everything is going down and being overwhelmed without being able to think wisely.

If you are over thinking about something, get worried easily, lose your focus, can't control emotions then yes you have a problem with anxiety.

Heart starts racing, you feel incredibly hot, chest pressure, feel like you can't catch your breath!

The best way to truly know is to go to a psychotherapist and have them diagnose you. You would also know if you had a panic/anxiety attack. You could look up the symptoms in the DSM-5 and try to diagnose yourself but risk misdiagnosing yourself.

usually you will get a fast breath and kind of be a little scared and you should see a doctor if you are concerned about having anxiety

Technically only a doctor can truly say wether or not you have anxiety, but if you are scared, loss of appetite, increase or beginning of nausea, and are starting to feel depressed, you may have anxiety.

It will be different for everyone, but most people experience increased heart rate, flushing, feeling hotter, breathing faster, a knotted-up feeling in their stomach or chest area, panicked feelings, and racing thoughts.

Usually your heart beats faster and stronger, you feel sweaty, shaky and even dizzy. The are some examples of bodily functions related with anxiety.

A lot of the time you can experience the symptoms of anxiety, for example fear of socialising and possibly even know you have anxiety. However, to be properly diagnosed and know for sure you would have to see a medical professional and seek diagnosis.