Most people who consider penis enlargement treatments have normal-sized penises, meaning that they are adequately sized for sexual activity and urination. Manufacturers claim that products, including pills, creams, and stretching devices, can increase penis size. Some people also consider surgery. However, the Urology Care Foundation points out that nearly none of these methods work.

Men's anxiety about penis size has spawned a multi-million-pound global industry in clinically unproven "male enhancement products". While many men worry their penis is too small, research shows that most men's penises are normal and they needn't be concerned. Professor Kevan Wylie, a sexual medicine consultant, says men with concerns about their penis size should consider talking to a health professional before experimenting with treatments, which are mostly ineffective, expensive and potentially harmful.