Anxiety and depression are two different things, but they can act together. An anxious person may also be depressed. The two conditions share some similar traits, but they are different. For treatment purposes, it's important to make a distinction between the two.
An Anxiety Overview
People who have anxiety feel nervous and worried. Sometimes they get so nervous and overwhelmed that they feel like they can't breathe. Some people explain anxiety as "feeling on edge." Restlessness would be another way to describe this feeling. Anxiety can make you feel wired, like you've had too much caffeine. Anxious people have a hard time concentrating and sleeping. The condition can also cause a person to sweat, get a dry mouth, feel dizzy or get sweaty palms. In the most severe cases, anxiety can cause stomach problems or a heart attack.
It's caused by mental or physical triggers. Mental triggers are different for everyone. One person may feel nerves before a big test while another may feel it before giving a work presentation. Another person may feel uncomfortable around dogs. These are all mental triggers. Physical triggers are caused by the body. For example, asthma attacks tend to make people anxious because the attack itself blocks a person's breathing path. Not being able to breathe is very unsettling.
An Overview of Depression
Depression is a mental condition that, like anxiety, is caused by physical and mental triggers. It makes a person feel completely hopeless, like life isn't worth living. Those experiencing mild cases feel sad and don't know why they can't shake the feeling of sadness. Those who experience these feelings frequently may have a physical predisposition. In other words, they have a chemical imbalance in their brain that makes them depressed. These people tend to have severe conditions such as bi-polar disorder. Mental triggers tend to focus around events. For example, if there's a death in the family a person may become depressed.
The disease has a lot of side effects, one of which is a feeling of anxiousness. This is how anxiety and depression go hand in hand.