A dorsal penis length of 2 cm or less in the neonatal period is considered to be short penis. In contrast, the definition of small penis in adult men lacks a uniform standard. This is mainly due to differences in ethnicity, region, living habits, the state the penis is in at the time of measurement, and the method of measurement. The average length of adult male penis in China is 8.08cm, and the average erect effective length is 12.4cm, with 9.5-15.5cm accounting for 95%. Penis length measurement is done by pressing a hard ruler next to the penis toward the pubic bone to measure the length of the penis when it is flaccid, and then traction on the penis when it is fully erected. A penis shorter than 4cm when flaccid, 7cm when stretched, and 9.5cm when effectively erect is considered small. What is penis lengthening? Penis lengthening refers to the use of surgical methods to cut off part of the ligament, so that part of the penile corpus cavernosum, which was originally fixed on the pubic bone, is released and protrudes out of the body, thus increasing the length of the penis. As a result, the tree grows by 1 foot. The result is that the tree grows by 1 foot. After the roots are pulled up, the tree still has 2 feet of roots left to absorb nutrients and water, and does not die. Penis enlargement is a surgical procedure to make the penis relatively longer by similar reasoning, not absolutely longer. What can be achieved with penis lengthening? Penis lengthening is to make the buried stem leave the tissue and stand up on the surface of the body, while achieving to make the penis lengthen 2-6cm, the operation has the advantages of no pain, short time, quick recovery, no need to remove stitches, one time success, no reply, etc. The average penis lengthening surgery can extend the penis by an average of 3 cm, but it varies from person to person, some can reach 5 cm and some may be less than 3 cm. It is important to note that penis lengthening is not as miraculous as some private hospitals advocate; it mainly increases the length of the penis in a dangling soft state, while the increase in penis length after erection is not obvious. The procedure can also be interpreted as a cosmetic surgery and not a change in function. Is penis lengthening safe? Penis lengthening is a mature, proven procedure with positive results. The post-operative recovery is quick, healing in 7-10 days, and has little impact on life and work. Mild post-operative penile edema is the most common complication, anti-inflammatory drugs are available for 3-5 days, and the edema usually subsides a week after surgery. However, it is not a very simple surgery, and if not handled well, it may not work, or it may damage important anatomical structures such as the corpus cavernosum, dorsal penile artery, deep penile vein and dorsal penile nerve, resulting in post-operative hematoma, infection, and even erectile dysfunction. What is the effect of penile lengthening on erection? The most significant cost of this procedure is the reduced stability of the penis after surgery. Sometimes, the penis does not reach the angle of less than or equal to 90 degrees that the normal penis naturally makes with the abdominal wall when erect before surgery. In other words, the post-operative period may change the direction of the penis after erection, but there is no effect on the erectile function itself, and there is no significant lengthening effect on the length of the penis after erection. Which hospitals should I choose for penis lengthening? At present, many private hospitals in China are carrying out the operation under the guise of penile lengthening, without mastering the technology, and most of them are ineffective after the operation, and all kinds of problems are common after the operation.