Why does the glans have a sense of pain when the foreskin is retracted?

Patient's question:

Patient Gender: Male
Why does there be pain in the glans when the foreskin is retracted?

Doctor's answer:

Penile phimosis refers to a condition in which the penis of an adult male is covered by the foreskin, preventing the glans from being fully exposed. It can be categorized into true phimosis and false phimosis. True phimosis is when the glans cannot be fully exposed even when the penis is erect. False phimosis, on the other hand, is when the glans cannot be fully exposed at rest but can be fully exposed when the penis is erect. Phimosis, in contrast, refers to a condition where the foreskin completely covers the glans, with the glans never being exposed at any time.
Considering the prevention of infection and improvement in sexual life, it is advisable to undergo a circumcision procedure at a local reputable urological hospital in a timely manner to avoid improper treatment and infection in small clinics.