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This section discusses 895 medical conditions causing Anxiety. A simple discussion of these causes with additional information is below. The following medical conditions are some of the possible causes of Anxiety. There are likely to be other possible causes, so ask your doctor about your symptoms. 1  Normal anxiety. 2  Normal fear. 3  Emotional disorders Anxiety disorders. Generalized anxiety disorder.  Physical conditions causing anxiety include: Hyperthyroidism. 1  Hyperglycemia. Marijuana - a form of cannabis. 2  Cannabis. Amphetamine intoxication.  Alcohol withdrawal.
Physical symptoms of anxiety include shortness of breath, muscle tension, a fast heartbeat and dizziness. Anxiety manifestations also include nausea, irritability, trouble sleeping, difficulty concentrating, trouble breathing and trembling. Anxiety occurs when the chemicals located in your brain (neurotransmitters) are decreased.