Girls who want to pee and can’t, usually have two major reasons, including urinary tract infection and urinary retention, as follows: 1. Urinary tract infection: mostly closely related to urinary tract infection, manifested as frequent urination, urgent urination, painful urination, and even incomplete urination, that is, bladder irritation symptoms are more obvious, need to do routine urine examination, observe whether there are white blood cells in the urine as well as pathogenic bacteria. If the diagnosis of urinary tract infection is clear, treatment with antibiotics is usually required. The infection can be controlled with the medication and the related symptoms will disappear immediately. 2. Urinary retention: A large amount of urine accumulates in the bladder and cannot be discharged, which is usually called urinary retention. There are more causes of urinary retention, which are divided into two categories, including obstructive urinary retention and non-obstructive urinary retention. Among them, obstructive urinary retention mainly includes urethral strictures, bladder or urethral stones, tumors, and in male patients, prostatic hyperplasia. And non-obstructive urinary retention usually refers to the urinary system without any pathology, but mainly due to neurological or organic factors that cause urinary dysfunction, such as brain tumor, traumatic brain injury, spinal cord tumor, spinal cord injury, peripheral neuropathy, surgery and post-anesthetic irritation, which can lead to urinary retention.