Most common cause of Conn's syndrome is -

Conn's syndrome is primary hyperaldosteronism caused by an adrenal adenoma producing aldosterone. It is characterised by low renin levels. Most people have hypeension due to sodium retention which may cause poor vision or headaches . Occasionally there may be muscular weakness, muscle spasms, tingling sensations , or excessive urination due to hypokalemia. Complications include cardiovascular disease such as stroke, myocardial infarction, kidney failure, and abnormal hea rhythms. Reference : page 780 Davidson's Principles and practice of Medicine 22nd edition