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Surgery to repair arteries can reduce ED caused by obstructions that block the flow of blood. The best candidates for such surgery are young men with discrete blockage of an artery because of an injury to the crotch or fracture of the pelvis. The procedure is almost never successful in older men with widespread blockage. Erectile dysfunction stems from a number of different causes. Some of them are emotional, like stress, anger, worry or depression. Some of them involve the effects of medication, most frequently treatments for blood pressure , epilepsy, depression or heart disease. A low testosterone level is another reason for erectile dysfunction. Whatever the cause of the problem, there are ways to treat it that involve the use of natural remedies. "When you calculated a global cardiovascular risk, [it] was strongly associated with the probability that you had erectile dysfunction," said Grover, a professor of medicine and epidemiology at McGill University Health Centre in Montreal. "And subsequently there have been other studies that have shown that people who have erectile dysfunction are, in fact, more likely to develop cardiovascular disease in the future." looking for cheap viagra online? real viagra online without prescription bDivisione di Andrologia, Universita degli Studi di Pisa, Italia;