Hi, left testicle hurts to touch at the top but no where else. i do not have any swelling or discolouration. pain is not constant and not unbearable. i did strain myself yesterday at work, could this be the cause?

It could be related since straining can sometimes help push a bowel loop into and inguinal hernia. Though I don't have enough detail to know if this is the reason. There are other entities, possibly more likely, like epididymitis that can present as focal pain. The most worrisome case would be testicular torsion a medical emergency. You may want to visit a urologist and discuss your symptoms.

Yes. Pl wear a good supprt under wear and use some dry heat to the area (over the clothes) for a few days.