Endocrine, nutritional, and metabolic diseases (E00-E90).
- Hyperthyroidism (overactive thyroid gland).
Cardiovascular system (I00-I99)
- Cardiovascular disease, unspecified.
Psyche – nervous system (F00-F99; G00-G99).
- Depression
- Organic anxiety disorders
- Personality disorder
- Primary anxiety disorders such as agoraphobia (claustrophobia).
- Psychiatric anxiety disorders
- Addictive disorders, especially alcohol dependence.
Other conditions that can be confused with social phobia:
- Shyness