You have developed a serious condition such as arterial thrombosis, where your arteries are blocked by blood clots. This may cause you to experience symptoms such as pain, coldness, and numbness in your arm. Among the factors that can cause arterial thrombosis are things such as high blood pressure, high cholesterol, or smoking. You might need a medical process called thrombectomy to remove the clots and recover the blood circulation. It is essential to abide by your doctor's orders and follow the treatment plan to avoid further health issues.