Sudden, severe pain in one testicle
Pain that starts quickly, often without warning
One testicle sitting higher than the other
Testicle that looks twisted or in an unusual position
Swelling of the scrotum
Nausea or vomiting with testicle pain
Lower abdominal pain along with testicle pain
Pain that does not improve or keeps getting worse
Tenderness when touching the testicle or scrotum
A testicle that feels firmer than usual
Symptoms after exercise, injury, or during sleep
Urgent need for immediate medical care if these signs are present