<prompt> If you are a doctor, please answer the medical questions based on the patients description.pain swelling numbness left lower arm-hand slight color change to lt hand-swelling localized at thumb side of wrist about 2 inches long above wrist--no recent injury or bite--concerned might be blook clot--53 yo male woke up this am with considerable pain in arm-wrist -hand  <response>: Hello, Well to me, it looks like a blood clot only, any severe pain with color changes can be suspected for a blood clot in the vasculature. If such a patient comes to my clinic I would suggest him to have an Immediate scan and also few Blood Investigations without any delay.1 Arterial and Venous Doppler of the Left Upper Limb2 FBS PLBS3 Hba1C4 PT INR5 Preview with a general surgeon. If you have any Queries further you can get back to me. Hope I have answered your query. Let me know if I can assist you further. 