Testicular Tumor: This is a common cause of testicular swelling, and the presence of hematuria could indicate metastasis to the kidneys or bladder, although hematuria is more commonly associated with other conditions. Testicular tumors can cause swelling and, if they metastasize, could potentially lead to hematuria through various mechanisms.

Epididymitis: Inflammation of the epididymis, often due to infection, can cause testicular swelling. While epididymitis itself might not directly cause hematuria, an associated infection like pyelonephritis or a stone could.
Orchitis: Similar to epididymitis, orchitis (inflammation of the testis) can cause swelling and, in some cases, might be associated with systemic symptoms or conditions that could lead to hematuria.
Varicocele: A varicocele is an enlargement of the veins within the scrotum, similar to varicose veins. While it's primarily associated with infertility and aching, in rare cases, it could be associated with conditions leading to hematuria, though this is less direct.

Testicular Torsion: Although torsion typically presents with acute pain and might not directly cause hematuria, it's an emergency that requires immediate attention. The swelling could be a late sign, and any delay in diagnosis could result in loss of the testicle.
Kidney Stone: A stone could cause hematuria and, if it obstructs the ureter, could potentially cause referred pain or swelling in the testicle due to shared nerve roots, although this would be an uncommon presentation.

Sarcoidosis: This autoimmune disease can cause granulomatous inflammation in various parts of the body, including the testes and kidneys, potentially leading to swelling and hematuria, though it would be an unusual presentation.
Polyarteritis Nodosa (PAN): A vasculitis that can affect multiple organ systems, including the kidneys and potentially the testes, leading to a wide range of symptoms including swelling and hematuria. However, this would be a rare and unusual cause of the symptoms described.