Throughout studies of anxiety and<unk>  disorders, scientists have been unable to locate a singular cause. The possible causes of anxiety and depression are often similar to one another and the comorbidity of the two disorders is quite high, with 60% of those with depression also having some form of anxiety disorder. There are multiple possible causes for<unk> , but they can be separated into three main categories: biological, psychological, and environmental factors. Biological factors are factors such as genetics and issues with neurotransmitters. Scientists have suggested a link between anxiety and an overactive nervous system, but this has not been confirmed. Psychological factors include psychological damage or struggles, such as excessive stress or trauma. Environmental factors are often linked to psychological factors, as things that cause stress or trauma are environmental factors. Causes of stress in the environment can be things like a poor home environment or poverty. Psychological causes are often complicated and the direct cause of<unk>  is unknown. Usually, it is assumed that psychological conditions are caused by a combination of biological, psychological, and environmental conditions. The high comorbidity of depression and anxiety, as well as the existence of<unk>  suggests that these two conditions have similar causes, but this is still unconfirmed.
Mixed anxiety–depressive disorder
Late life depression
Separation anxiety disorder
Social anxiety disorder
Generalized anxiety disorder
Somatization disorder
Body dysmorphic disorder
Panic disorder