Insect bites in the urethra or insects crawling in the vagina sense and which conditions differential diagnosis, let’s understand the following: The disease is usually the knowledge of the transmission of STDs do not understand, or have high-risk behavior after the suspicion that they have STDs, so should be distinguished from paranoia, the latter is common is the delusion of victimization, the patient always think that the testing equipment is inaccurate, whether the reagents are expired, and whether the testing personnel deliberately want to harm themselves, etc. Thoughts. The distinction can usually be made based on the progression of the disease and whether or not the patient has had a high-risk sexual life, etc. in conjunction with the patient’s previous life history. Delusional disorder: Also known as delusional disorder, it is a psychiatric diagnosis that refers to “the possession of one or more non-bizarre delusions in the absence of any other psychotic symptoms”. Patients with delusional disorder do not have a history of schizophrenia and do not have significant hallucinations. However, depending on the specific type, tactile and olfactory hallucinations may occur. Despite these hallucinations, people with delusional disorders are usually functionally competent and do not engage in bizarre and bizarre behavior as a result. Urethral itching: Commonly associated with sexual gonorrheal urethritis (acute gonorrhea) with an incubation period of 1-14 days, often 2-5 days. At first, it is acute anterior urethritis, redness, swelling, itching and slight stinging at the urethra, followed by thin mucus outflow, causing discomfort in urination. Urethral pain: common in patients with prostatitis manifesting symptoms include: painful urination, urinary urgency, frequent urination, urinary waiting, urinary interruption, urinary weakness, urinary dripping, urinary bifurcation, urinary retention, white dripping from the urethra, blood in urine, soreness in the lower back and knees, radiating pain in the groin and both sides of the thigh root, pain or swelling in the small abdomen and perineum, anal swelling pain, dizziness, weakness, itching and burning in the urethra, painful swelling in the testicles, dampness in the scrotum, seminal emission Dizziness, weakness, burning pain in the urinary tract, testicular pain, scrotal dampness, seminal emission. Decreased libido and sexual function, infertility, etc. Itching sensation in the urethra: a burning sensation during urination is a diagnostic symptom of mycotic urethritis. Mycotic urethritis is an inflammatory lesion of the urethra caused by mycobacteria. Diagnosis based on: 1. symptoms urethral itching, burning sensation when urinating. 2. examination urethral orifice with a small amount of discharge overflowing, watery or mucus-like, a few red or black. 3. laboratory tests Take urine sediment, urethral secretions or urethral swabs for mycobacteria or culture. Especially when the catheter is left in place, it should be checked regularly.