Vascular pain is generally considered to be caused by phlebitis or venous spasm. Phlebitis generally develops from varicose veins or venous thrombosis and is categorized into superficial phlebitis and deep phlebitis. 1. Superficial phlebitis is mostly due to prolonged varicose veins that are not treated in time, which subsequently leads to increased blood stasis and the development of subcutaneous hardness, redness, swelling, heat, and pain, which occur along with the travel of superficial veins. 2. Deep phlebitis is often caused by surgery, trauma, tumor and other factors, leading to deep vein thrombosis, and then the thrombus stimulates the surrounding tissues and blood vessels, which is often manifested by pain along the venous route, accompanied by swelling. 3. After being subjected to physical stimuli such as heat and cold, local veins will contract. Generally, the contraction of veins can be relieved after the disappearance of the stimuli, but in some patients, the contraction of veins will not be relieved after the disappearance of the stimuli and persistent spasms will occur, which will lead to pain. If you have symptoms of vascular pain, you should consult a doctor in time to get a clear diagnosis and follow the doctor’s instructions.