Diagnosis: Varicocele (Most Likely) with Possible Thrombosis
The most likely diagnosis is a left-sided varicocele—dilated veins of the pampiniform plexus—which characteristically presents as thickened scrotal veins with burning or aching pain that worsens without scrotal support. 1
Clinical Reasoning
The description of "thick veins" in the left scrotum with burning pain that worsens without support is pathognomonic for varicocele. The left side predominance occurs because the left testicular vein drains into the left renal vein at a right angle, creating higher venous pressure compared to the right side which drains directly into the inferior vena cava.
Key Diagnostic Features to Confirm:
- "Bag of worms" sensation on palpation of the left scrotum
- Symptoms worsen with standing and improve when lying down 1
- Pain described as aching, heaviness, burning, or throbbing 1
- Symptoms worse at end of day after prolonged standing 1
- Relief with scrotal support (which you're already experiencing)
Immediate Diagnostic Workup
Obtain Color Doppler ultrasound of the scrotum in both supine AND standing positions 2. This is the gold standard initial imaging and will:
- Confirm dilated pampiniform plexus veins (>3mm diameter)
- Document venous reflux with Valsalva maneuver
- Rule out thrombosis (critical given your burning pain) 3, 4
- Exclude testicular masses or secondary causes
Important Caveat - Consider Thrombosis
If pain is acute and severe, spontaneous varicocele thrombosis must be excluded 3, 4, 5, 6, 7. This rare complication presents with:
- Sudden onset severe scrotal pain
- Palpable cord-like swelling
- Echogenic thrombus visible on ultrasound 3
Risk factors for thrombosis include diabetes, prolonged standing, and heavy physical activity 3. Recent case reports demonstrate this can occur spontaneously and requires anticoagulation therapy 4, 7.
Management Algorithm
If Uncomplicated Varicocele (No Thrombosis):
- Conservative management first: scrotal support, NSAIDs, avoid prolonged standing 1
- Interventional treatment if: persistent symptoms despite conservative measures, documented valvular reflux on ultrasound 1
- Endovascular laser ablation preferred over surgery (better tolerated, fewer adverse effects) 1
If Thrombosis Confirmed:
- Anticoagulation therapy (typically 4 weeks of direct oral anticoagulant) 7
- Activity restriction and scrotal support 7
- Conservative management achieves good outcomes without surgery 4
Critical Red Flags
Obtain abdominal imaging if:
- Age <15 years (consider nutcracker syndrome) 8
- Right-sided varicocele (suggests IVC obstruction or retroperitoneal mass)
- Varicocele that doesn't decompress when supine (suggests venous obstruction)
- New onset in older adult (exclude renal cell carcinoma with tumor thrombus) 3
The burning quality of your pain and dependence on support strongly suggests venous congestion from varicocele, but ultrasound confirmation is essential to exclude the rare but important complication of thrombosis.