Should you be worried if the left vas deferens becomes swollen after arousal and very painful?

Yes, experiencing swelling and severe pain in the left vas deferens after arousal warrants prompt medical attention. This condition is known as epididymo-orchitis, an infection or inflammation of the epididymis (the coiled tube that carries sperm from the testes) and the testes.

Epididymo-orchitis can be caused by various factors, including sexually transmitted infections (STIs) like chlamydia or gonorrhea, bacterial infections, or viral infections such as the mumps virus. In some cases, it can also occur as a result of certain medical procedures or trauma involving the reproductive organs.

Symptoms of epididymo-orchitis include:

- Swelling, pain, and tenderness in the scrotum

- Fever

- Chills

- Painful urination

- Frequent urination

- Cloudy or bloody urine

- Difficulty walking or sitting due to discomfort

If you suspect epididymo-orchitis, seek immediate medical evaluation, as timely diagnosis and treatment are essential to prevent potential complications, including infertility and chronic pain. The healthcare provider may recommend antibiotics, pain relievers, and rest to manage the infection and relieve symptoms.