Anxiety and its mimics

There are many symptoms of anxiety.  In adults anxiety may feel like:

Feeling nervous

Sweating, trembling, or feeling a fast heart rate

Gastrointestinal symptoms

Rapid breathing

Being fatigued easily

Difficulty concentrating

Feeling irritable

Feeling restless

Difficulty sleeping

The symptoms of anxiety must occur more often than not over several months to confirm the diagnosis. Anxiety symptoms may present with other disorders, such as alcohol abuse, post- traumatic stress, medication side effects, schizophrenia, or obsessive compulsive disorder, for example.

What are some disorders that cause anxiety, but are not anxiety?  People may feel symptoms similar to anxiety with these unrelated medical conditions:

Temporal lobe epilepsy

POTS

Hyperthyroidism

COPD / trouble breathing

Heart disease