There are several different types of anxiety disorders. The most common is generalized anxiety disorder. This condition causes symptoms such as:

Being constantly on edge
Restlessness
Irritability
Social withdrawal
Problems concentrating
Insomnia
Digestive upsets
Headaches
Muscle aches
Trembling

If you have generalized anxiety disorder, it can affect your work performance, and even make it hard to work at all.
Severe anxiety can cause panic attacks — you freeze and feel unable to function. A racing heart, shortness of breath, sweating, and shaking are typical of a panic attack. It’s not uncommon for panic attacks to mimic the symptoms of a heart attack. Frequent panic attacks indicate you have panic disorder.

Some people suffer panic attacks when faced with something they fear extremely, called a phobia. Common phobias include spiders (arachnophobia) and confined spaces (claustrophobia). Fear of social situations is a type of phobia known as social anxiety disorder.

Obsessive-compulsive disorder (OCD) is another common problem related to anxiety. OCD symptoms start with obsessive thoughts and ideas that are typically unpleasant and unwanted, but impossible to control.

In response, you might develop compulsions, which are ritualized activities you feel you have to carry out. A typical example is having an obsession with germs and dirt that causes you to obsess about cleanliness and wash continually.