Recurrent hypokalemic paralysis: An atypical presentation of hypothyroidism

Hypothyroidism presenting as recurrent hypokalemic paralysis is rare in the literature. This transient and episodic neurological condition is commonly associated with thyrotoxicosis. We report a case of young female admitted with recurrent paralytic attacks since last 1 year. She had no symptom of hypothyroidism. She had weakness of all four limbs, delayed relaxation of ankle jerks, and normal higher mental function. There was no enlargement of thyroid. Serum potassium level ranged from 1.6 to 3.2 meq/L during attack with high serum creatine phosphokinase level. Electromyography was normal. The patient was diagnosed having chronic thyroiditis with high thyroid-stimulating hormone and thyroid-related antibodies. Follow up shows satisfactory result with thyroxine replacement. It is an extremely rare and unusual presentation of hypothyroidism, probably the fourth reported case of hypothyroidism with hypokalemic paralysis, to the best of our knowledge.