What causes a dull pain in the left testicle?

Dull pain in the left testicle may be caused by various factors, mainly including: 1. Testicular trauma: Injury or trauma may lead to testicular pain, accompanied by symptoms such as bruising and swelling. 2. Orchitis: Caused by pathogen infection or inflammation, characterized by testicular enlargement, pain, and high fever. 3. Varicocele: Blood accumulation in the veins may cause testicular pain, along with testicular swelling and dilated veins. 4. Testicular torsion: Rotation of the testicle obstructs its blood supply, resulting in severe pain; prompt medical attention is required for repositioning. 5. Tumors: A tumor in the left testicle may also cause dull pain and should be diagnosed through imaging studies.