It is proven that erectile dysfunction may be an early sign of heart disease. There are a number of reasons these conditions are related. Firstly, the buildup of plaque in the arteries can limit blood flow to the penis, leading to difficulty with an erection. Another reason, according to the Mayo Clinic, is due to the dysfunction of the inner lining of the blood vessels and smooth muscle. This limits blood supply to the penis and the heart, causing first ED and then heart disease.

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