Acute mesenteric venous thrombosis (MVT) is a rare but potentially life-threatening condition, with the superior mesenteric vein (SMV) being the most frequently affected site of thrombosis. It is commonly observed in patients with underlying disorders that disrupt Virchow's Triad, which includes hypercoagulability, stasis, and endothelial injury [1]. In its acute form, SMVT is frequently associated with intestinal ischemia, complicating its clinical management and treatment [2]. The thrombotic occlusion of the mesenteric veins leads to impaired venous return, bowel ischemia, and in some cases, infarction, significantly impacting patient prognosis [3, 4]. We present a case of acute superior mesenteric venous thrombosis (SMVT) in a 42-year-old man who presented to our emergency walk-in clinic with acute onset of severe abdominal pain. He was referred to secondary care, where his contrast-enhanced abdominal Computerized Tomography (CT) scan revealed thrombosis of the superior mesenteric vein, splenic vein, and partial thrombosis of the intrahepatic part of the right portal vein. However, the CT scan showed no evidence of small bowel infarction or ischemia. He was subsequently managed with conservative measures.