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Although the mind can play a role in men's erectile dysfunction, it's usually a function of another health condition in buy viagra the body, according to buy viagra online Stanford urologist Dr. Michael Eisenberg, director of Stanford's male reproductive medicine and surgery.

Eisenberg says that 85-90 percent of erectile dysfunction can be linked to common conditions like high blood pressure, diabetes, smoking or obesity. Medications, buy viagra no prescription such as buy viagra those to treat blood pressure or psychiatric conditions like depression, can cause erectile buy viagra online dysfunction. It is also a common side effect for men receiving prostate cancer treatments.

Erectile dysfunction symptoms can also buy viagra be an early warning sign of other medical troubles ahead.

"It can precede cardiovascular disease by three to four years," Eisenberg said. "I think most men probably do not realize that."

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Half of all men ages 40 to 70 experience erectile dysfunction, and that number is expected to increase. A widely cited 1999 study from the New England Research buy viagra Institutes projected that prevalence of the condition will grow from 152 million in 1995 to 322 million buy cheap viagra online worldwide by 2025, with 9.1 million more cases expected in the United States.

Eisenberg said that many men assume erectile dysfunction symptoms are a natural part of aging, and though that may be true, doctors can help determine that and possibly catch other health conditions before they become more serious.

Men can buy viagra generic online help prevent erectile dysfunction - and its possible buy viagra root causes - with good buy viagra online diet and exercise, or as Eisenberg put it, "anything that's good for your heart.