Impotence, or erectile dysfunction, affects millions of men worldwide. For some it only happens now and then. For other men, it is a longterm problem. Impotence can have a physical cause such as damage to nerves, drug side effects, certain diseases like diabetes or kidney disease, and surgery for prostate cancer or bladder cancer. It can also be due to psychological issues such as stress, depression, anxiety, and worries about sexual performance.

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