Case Overview and Initial Differential Diagnosis

A 20-year-old male presented with severe thigh pain and weakness that began abruptly after a day of welding in extreme heat. Initial assessments showed significant weakness in his lower extremities while upper body strength remained intact. The differential diagnosis for his symptoms included conditions like Guillain-Barré syndrome, disc herniation, and rhabdomyolysis. However, these options did not fully align with his clinical picture, particularly due to the lack of additional symptoms typically associated with these conditions.