Testicular swelling refers to enlargement or a lump in the testis or scrotum. It can affect one or both sides and may be accompanied by pain, fever, redness or a heavy sensation. Below is a concise guide to likely causes, when to seek urgent care, and which specialists may be involved in evaluation.
Swelling itself is a symptom, not a single diagnosis. It may present as fullness, a discernible mass or visible enlargement of the scrotum. Associated features—such as how quickly the swelling began, presence of pain, fever or recent injury—help narrow possible causes.
A range of conditions can cause scrotal swelling: infections of the epididymis or testis, fluid collection around the testis (hydrocele), enlarged veins (varicocele), inguinal hernia, blunt trauma, twisting of the spermatic cord (testicular torsion), or less commonly a testicular tumour. Age, symptom pattern and accompanying signs guide which cause is more likely.
Seek urgent medical assessment if swelling starts suddenly with severe pain, if the scrotum changes colour, if vomiting or high fever accompanies the swelling, or if swelling follows significant trauma. These signs may indicate conditions that need prompt evaluation; contact emergency services or go to urgent care without delay.
Initial assessment may be done by a primary care clinician or in an emergency setting. Examination of the groin and scrotum is the first step. Scrotal Doppler ultrasound is commonly used to check blood flow and distinguish torsion from other causes. Urine tests and blood tests may be ordered to look for infection or systemic illness. Cases requiring ongoing care are usually referred to a urologist.
Follow-up depends on the underlying cause: some conditions resolve after treatment, others need monitoring or specialist management. If swelling is recurrent, persistent or associated with fertility concerns, a urological review may be appropriate. Whenever symptoms worsen or new concerning signs appear, seek medical reassessment.
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