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; it is likely that many factors contribute to a person's chances of developing anxiety. Scientists have broken down the potential causes into three groups, genetics and early learning, brain biochemistry, and the fight or flight mechanism.

Brain Biochemistry - Chemical Imbalance
Neurotransmitters are chemical messengers in the brain that regulate a person's thoughts and feelings. Two of the primary neurotransmitters that affect a person's feelings are serotonin and dopamine