Neurotransmitters are released from one neuron and attach to a receptor on another neuron. However, if the receptor is blocked and unable to receive the neurotransmitter, it can create an imbalance in the levels of the neurotransmitter in the brain, and can cause symptoms of anxiety. There are many kinds of neurotransmitters but those that are involved in anxiety are called serotonin and dopamine. Imbalance of these chemicals will result to anxiety and other problems.Life Circumstances – Traumatic life experiences can also set the stage for anxiety disorders which leads to Post Traumatic Stress Disorder.