Blue balls is a colloquial term for a real, medically recognized condition called epididymal hypertension. It describes temporary discomfort or aching in the testicles that can occur after a period of sexual arousal without ejaculation. The sensation is usually short-lived and not dangerous, though it can be uncomfortable. What you should know:

• Symptoms: Aches or heaviness in the testicles, sometimes with increased sensitivity or a mild blue-ish tint to the scrotal skin. The relief typically comes after ejaculation or once arousal subsides.
• Causes: Prolonged sexual arousal without ejaculation leads to increased blood flow to the pelvic region. If release (ejaculation) does not occur, the sensation can persist briefly as the body returns to baseline.
• Safety: It is not harmful and does not cause long-term damage. It does not require medical treatment unless pain is severe, persistent beyond a short period, or accompanied by other concerning symptoms (like swelling, fever, or redness).
• Relief strategies: Ejaculation (via orgasm or masturbation) typically relieves symptoms. Distraction or a non-arousing activity can also help while the body returns to its non-aroused state.

When to seek medical advice:

• If the pain is severe, lasts more than a few hours, or is accompanied by swelling, redness, fever, or injury.
• If there are any signs of infection or other unexpected symptoms.

If you'd like, I can tailor this further to your situation (age, recent symptoms, any prior medical conditions) and provide safer, practical guidance.