Ice packs for left testicular pain can reduce the local temperature and reduce the pain by decreasing the exudation. Left testicular pain may be caused by trauma or inflammation, then there will generally be a local increase in oozing, increased vascular permeability, then the use of ice packs, can stimulate the local temperature reduction, vascular constriction, blood flow is reduced, can reduce the tension of the local tissues, reduce oozing, so as to achieve the purpose of reducing swelling and pain. The use of ice is only a kind of physical therapy, but also need to go to the hospital in time to find out the cause of pain, and for the cause of the treatment, if it is caused by testicular or epididymitis, the need to use sensitive antibiotic treatment in a timely manner, such as ceftriaxone sodium, cefuroxime and so on. If the pain is caused by trauma, you need to lie down and rest, and if the testicular injury is more serious, you may even need surgery. Drugs should be applied under the guidance of a doctor.