Why is it that corticosteroids can increase blood pressure?

Unknown. Know one really knows why steroids cause high blood pressure in some people however, this effect may be caused by interactions with a cellular protein called proliferation-activation receptor Alpha (ppar-alpha). Persons who take steroids can also develop diabetes, bone loss cararacts, glaucoms or multiple other side effects from long term medication use.
Steroids. Fluid retention, weight gain, affects from the adrenal glands and this by-product trigger increased salt retained which increases blood pressure, and many other mechanisms.

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