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Other causes are anemia, claustrophobia, GERD, hypoglycemia or low sugar and some endocrine
problems. Endocrine
problems, such as an underactive
thyroid (called hypothyroidism), overactive thyroid (called hyperthyroidism), adrenal insufficiency (called Addison's disease), low blood sugar levels, and in some cases, diabetes, may lead to hypotension and hence lightheadedness and an off balance feeling.
Certain types of epilepsies and seizures too can cause similar symptoms.