The presence of fluid in the left groin is mostly caused by syringomyelia, inguinal hernia, trauma and infection. Generally need surgical treatment or medication for symptomatic treatment, a small portion can be self-absorbed. 1. Syringomyelia: caused by inflammation or surgical trauma to the testicles and nearby tissues, excessive accumulation of fluid in the syringomyelia cavity, forming cystic lesions, accompanied by a feeling of falling. Untreated may cause inguinal effusion. Other people usually need surgical treatment, such as syringomyelia reversal, syringomyelia folding and so on. 2. Inguinal hernia: Inguinal hernia may cause inguinal effusion, which can be treated clinically by tension-free hernia repair, laparoscopic hernia repair treatment. 3. Trauma and infection: trauma such as inguinal area after impact, congestion and enlargement, resulting in tissue fluid leakage, the symptoms of serious cases with surgical treatment; infections such as lymph node inflammation, aggravation of the condition of the abscess formation, resulting in inguinal effusion, generally require surgical incision and drainage of purulent secretions, regular dressing changes, and intravenous infusion of antibiotics, such as levofloxacin, ceftriaxone sodium and other antibiotic treatment. When inguinal effusion occurs, it is necessary to consult a doctor as soon as possible and follow the doctor’s instructions for timely treatment.