A boy who was perfectly well an hour ago is suddenly doubled over with severe pain in one side of the scrotum. He may also feel sick and vomit. The pain did not build up slowly — it came on abruptly, often waking him from sleep or starting during play or sport.
This sudden, one-sided testicle pain is the warning sign of testicular torsion — and it is one of the few true emergencies in a boy’s body where the clock decides the outcome. A twisted testicle can usually be saved if it is operated on within a few hours. Wait too long, and it cannot.
If your son has sudden, severe pain in one testicle, do not wait at home and do not wait until morning. Go to a hospital with surgical facilities now.
What Is Testicular Torsion?
The testicle hangs inside the scrotum from a cord — the spermatic cord — which carries its blood supply. In some boys, the testicle is not anchored normally and is able to swing and rotate freely, like a clapper inside a bell. This is called a bell-clapper deformity.
Testicular torsion happens when the testicle twists on its own cord. The twist first squeezes shut the veins, so blood pools and the testicle swells. The swelling then chokes off the incoming artery, cutting off oxygen. Starved of blood, the testicle begins to die.
That is why this is a race against time: every hour the testicle stays twisted, more of it is lost.
Which Boys Get It, and When?
Torsion can happen at any age, but there are two peak times in a boy’s life:
1. Around puberty — most commonly between 12 and 16 years. This is by far the more common group. The rapid growth and increased blood flow of puberty, combined with a bell-clapper deformity, make the testicle prone to twisting. This is the classic teenager who wakes at night with sudden agony in one testicle.
2. In newborn babies (around birth). This is a different type of torsion (the whole testicle and its coverings twist together, often before birth). It usually shows up as a firm, swollen, discoloured scrotum that is not painful. Any such finding in a newborn must be shown to a doctor straight away.
What Are the Warning Signs?
The signs that point to torsion rather than a milder cause are:
- Sudden, severe pain in one testicle — not a slow ache that built up over days. It often starts very abruptly.
- Nausea and vomiting — feeling sick along with the pain is common with torsion and uncommon with milder causes.
- A swollen, tender testicle that sits higher than the other, sometimes lying sideways (horizontally) instead of hanging vertically.
- Pain that does NOT ease when the testicle is lifted. (In milder infections, lifting often gives relief — with torsion it does not.)
Doctors also check the cremasteric reflex — normally, stroking the inner thigh makes the testicle on that side lift up. In torsion, this reflex is usually absent, and that is one of the most useful signs. But it is not perfect: the reflex is still present in up to 10% of boys who genuinely have torsion. So even if a doctor finds the reflex, torsion is not ruled out if the story is suspicious.
The honest message for parents: there is no single sign you can rely on at home. Sudden, severe, one-sided testicle pain should be treated as torsion until a surgeon proves otherwise.
Why Every Hour Matters — The Real Numbers
This is the part no parent should be shielded from, because it is exactly why speed saves the testicle.
The chance of saving the testicle falls steadily the longer it stays twisted. From the time the pain starts:
- Within 6 hours: about 95% of testicles can be saved.
- 6 to 12 hours: about 80%.
- 13 to 18 hours: about 60%.
- 19 to 24 hours: about 40%.
- Beyond 24 hours: about 20% — and after 48 hours, only about 10%.
Damage to the testicle begins quietly within the first 4 to 8 hours. In rare cases, irreversible damage can occur in as little as 2 hours. And even when surgery successfully saves the testicle, it can still shrink (atrophy) over the following weeks if blood flow was cut off for too long — the risk of late shrinkage is under 10% if surgery is within 12 hours, but rises to around 40% at 12–24 hours and about 75% beyond 24 hours.
This is why a surgeon will not wait. If the story sounds like torsion, the boy goes to the operating theatre — imaging is skipped if it would cause any delay.
How Is It Diagnosed?
Torsion is first and foremost a clinical diagnosis — made from the history and the examination. When the picture is classic, the surgeon takes the boy straight to theatre without waiting for tests.
When the diagnosis is genuinely uncertain, a colour Doppler ultrasound is the test of choice. It shows whether blood is flowing into the testicle (flow is reduced or absent in torsion) and can sometimes show the twisted cord directly. But the ultrasound must never become a reason to delay surgery when suspicion is high.
How Is It Treated?
The treatment is an emergency operation — scrotal exploration.
Through a small incision, the surgeon untwists the cord and wraps the testicle in warm gauze to see if it recovers its colour and blood supply:
- If the testicle recovers, it is stitched into place so it can never twist again (orchidopexy).
- If the testicle is already dead, it has to be removed (orchiectomy). Leaving dead tissue behind causes infection and harm.
The other testicle is always fixed at the same operation — even though it is healthy. This is one of the most important points. The bell-clapper deformity that allowed one side to twist is present on both sides in at least half of boys. If the second testicle is not stitched down, it can twist later — and then the boy could lose both. Fixing it now prevents that.
Will It Affect Fertility?
This deserves an honest answer. Losing one testicle does not usually prevent a man from fathering children, because the remaining testicle can compensate. However, research shows that even after a testicle is successfully saved, fertility can be subtly affected — some men show reduced sperm counts or motility later in life. The longer the testicle was twisted, the greater this effect tends to be. The reasons are still debated (immune effects, reduced blood flow to the other side, or an underlying difference present from birth). It is one more reason that getting to hospital quickly matters — and a reason these boys should have long-term follow-up.
What Every Parent Must Know
- Sudden, severe pain in one testicle is an emergency, day or night.
- Do not apply heat, give painkillers, and “wait to see if it settles.”
- Do not wait until the morning or for a regular clinic appointment.
- Go directly to a hospital that can perform emergency surgery and tell them you are worried about testicular torsion — ask for it by name.
The single biggest factor in saving the testicle is how fast the boy reaches the operating theatre.
When to See a Pediatric Surgeon
Any boy with sudden testicle or groin pain — especially with swelling, a high-riding testicle, or vomiting — needs urgent assessment at a centre with paediatric surgical and ultrasound facilities. A swollen, discoloured scrotum in a newborn also needs same-day surgical review.
Dr. Tanmay Motiwala is a pediatric surgeon in Raipur, Chhattisgarh, trained at AIIMS Jodhpur. He manages testicular torsion and other paediatric surgical emergencies for children and adolescents from across Chhattisgarh and central India. For sudden, severe testicle pain, go directly to the nearest hospital with surgical facilities — do not wait for an appointment.
Related reading:
- Undescended Testis in Baby Boys: What Every Parent Should Know
- My Child Has a Swelling Near the Groin — Could It Be a Hernia?
- Appendicitis in Children: When Stomach Pain Needs Surgery
⚠️ Important Disclaimer: This article is for general information and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Every child’s condition is different — facts, prognosis, and management can vary significantly from case to case. Please consult a qualified pediatric surgeon for advice specific to your child. In an emergency, go to the nearest hospital immediately.
Sources: Coran’s Pediatric Surgery (7th ed); Rob & Smith Operative Pediatric Surgery (7th ed).
