When the patient has the situation that there is always mucus in the glans with foul odor and ejaculated sperm smells bad, it may be caused by circumcision and glansitis, seminal vesiculitis, urethritis and other reasons. 1. Foreskin glansitis: Foreskin glansitis is usually a collective term for phimosis and glansitis, which refers to the swelling and inflammatory reaction of the foreskin of the penis and the head of the penis, and its main manifestation is the redness and swelling of the foreskin and glans, burning pain, accompanied by foul smell or pus secretion. 2. Spermatitis: Spermatitis is a relatively common infectious disease, which may lead to a large amount of pus in the semen, accompanied by a foul taste of semen, pain during ejaculation, swelling and discomfort in the perineal area and other symptoms. 3. Urethritis: when the patient suffers from purulent urethritis, the semen may be mixed with pus in the urethra, and the discharge will have symptoms such as bruising, foul smell, and the patient is also accompanied by semen yellow color, urinary frequency, urinary urgency, pain in the urethra and other symptoms. It is recommended that patients seek timely medical examination to clarify the cause of the targeted treatment, pay attention to personal hygiene in life, often change underwear, but also pay attention to the observation of the condition, once the condition worsens should be timely medical treatment.