The possible causes of red itching on the glans are fungal glans, bacterial glans, trichomonas infection of the glans, genital herpes, and circumcision. 1. Fungal glans: when the glans is inflamed due to bacteria, fungi or viruses, there will be erythema of the glans, red rash, localized itching, and there will be vesicles and oozing during the acute attack, which is in line with the performance of the glans becoming red and itchy. 2. Genital herpes: genital herpes caused by sexual contact disease, in the glans and the coronal groove can appear flaky congestion or shallow elevation, localized can form congested shallow ulcers and glans red, itchy. 3. Hyperemesis gravidarum: Hyperemesis gravidarum will lead to insufficient cleaning in general, and the foreskin scale between the foreskin and the glans will accumulate, stimulating localized inflammation of the foreskin and mucous membranes, and red and itchy glans will appear on the glans. There are many reasons for the red, itchy glans, it is recommended to suspend sexual life, timely to the hospital urology, male or dermatology and venereal diseases, to find the cause and timely treatment, active treatment will improve the situation. In daily life, pay attention to cleanliness and hygiene, timely cleaning of the glans, change underwear diligently.