The penis is an exposed male external genital organ, and human height and weight, there are tall and short, heavy and light, the penis also has a large and small, but as long as in the normal physiological range is normal, will not affect the physiological function. Many young male friends do not understand this truth, often see their penis is smaller than others and worried, to the hospital for treatment, and sometimes even believe in the street advertising to penis enlargement treatment. I do not know that this practice will bring serious damage to their own. In the world, no one looks exactly the same, the human body’s various organs can not be the same size, there are always differences, generally in the largest and smallest range of change, as long as it is in the normal range there is no need to worry. The length of the penis under normal conditions is 3.7-10.6cm, with an average of 6.55cm. the transverse diameter of the penis averages 2.57cm. the circumference of the glans penis averages 8.50cm. so it can be said that every adult man’s penis varies in size, but as long as it is within the range of 3.7-10.6cm it is normal. Theoretically, a small penis requires less blood flow during erection than a large penis, so there is less chance of erectile dysfunction due to insufficient blood supply than a large penis. There are two major categories of common abnormalities: one is abnormal development of the sex characteristics; the other is the different types of hypospadias and supraurethral cleft. In these two abnormal states, not only is the penis shorter than normal, but there are also varying degrees of penile curvature that can affect sexual function and fertility and must be treated with surgical plastic surgery. For those whose penis length is within the normal range of small, there is no need for treatment, and even if certain treatments advertised are done, they may not achieve the desired results and purpose. The reason is that after men mature in puberty, their genitals are fully developed and will not change again, so there can be no magic pill to make the penis bigger again.