Deep Vein Thrombosis

Sarah is a 34-year-old female presenting with left leg swelling and pain for 3 days. Three days ago I noticed my left leg started swelling up. It came on pretty suddenly — by the evening it was noticeably bigger than my right leg. There's a constant aching pain in my calf that gets worse when I walk or stand for long periods. Your task is to take a focused history from this patient.