Inguinal Hernia: This is the most common cause of groin swelling, and when bilateral, it often presents with a history of heavy lifting, straining, or increased intra-abdominal pressure. The swelling is usually reducible and may be associated with discomfort or pain.

Lymphadenopathy: Enlargement of the lymph nodes in the groin area can be due to infections (like cellulitis or lymphangitis), inflammatory conditions, or malignancies. The swelling is typically firm and may be tender.
Varicocele: Although more common on the left side, varicoceles can be bilateral and present as a soft, compressible swelling in the groin that may worsen throughout the day.
Hydrocele: A collection of fluid around a testicle can cause swelling in the groin area, which is usually painless and may transilluminate.

Testicular Torsion: Although typically presenting with acute, severe pain and swelling of one testicle, in some cases, it can cause bilateral groin swelling if both testicles are affected. This is a surgical emergency.
Epididymitis: Inflammation of the epididymis can cause swelling and pain in the groin area. If not promptly treated, it can lead to complications like abscess formation or infertility.
Lymphoma: Certain types of lymphoma can present with lymphadenopathy in the groin area, which may be painless but is a critical diagnosis to make due to its implications for treatment and prognosis.

Sarcoidosis: A systemic disease that can cause lymphadenopathy, including in the groin area, though this is less common.
Filariasis: In endemic areas, this parasitic infection can cause lymphedema and swelling in the groin area, among other symptoms.
Pseudolymphoma: A rare condition that mimics lymphoma but is benign, it can cause lymphadenopathy, including in the groin area.