Orchitis may be caused by an infection from many different types of bacteria and viruses.

Most common virus that causes orchitis is mumps. It most often occurs in boys after puberty. Orchitis usually develops 4 - 6 days after the mumps begins

Orchitis may also occur along with infections of the prostate or epididymis

Risk factors orchitis include:

High-risk sexual behaviors

Multiple sexual partners

Personal history of gonorrhea or another STD

Sexual partner with a diagnosed STD

Symptoms:

Pain in the testicle

Blood in the semen

Discharge from penis

Fever

Groin pain

Pain with intercourse or ejaculation

Pain with urination (dysuria)

Scrotal swelling

Tender, swollen groin area on affected side

Tender, swollen, heavy feeling in the testicle

Treatment

Treatment may include:

Antibiotics, if the infection is caused by bacteria. (In the case of gonorrhea or chlamydia, sexual partners must also be treated.)

Anti-inflammatory medicines

Pain medicines

Bed rest with the scrotum elevated and ice packs applied to the area.