Cold and swollen calves refer to swollen calves and lowered skin temperature. Possible causes include too little activity, diabetes complications, varicose veins of the lower limbs and so on. 1. Too little activity: If you are bedridden or in a wheelchair for a long time, because of the lack of activity in the lower limbs, blood circulation slows down, blood reflux is impaired, metabolism slows down, and heat production decreases, you can experience swelling in the calves and a decrease in skin temperature, which is a normal phenomenon. 2. Diabetes mellitus complications: If long-term blood sugar control is not good, high blood sugar causes peripheral vascular disease, lower extremity arterial plaque formation, can appear swelling of the lower leg, skin temperature decrease, mostly accompanied by lower extremity darkness, pain and other symptoms. 3. Varicose veins of the lower limbs: Varicose veins of the lower limbs can cause obstruction of venous blood return in the lower limbs, which can also lead to swelling of the lower legs, lowering of the skin temperature, accompanied by soreness of the lower limbs, fatigue and other symptoms. Causes of calf swelling, skin temperature reduction of more reasons, but also may be related to tumors, vascular trauma, lumbar disc herniation and other diseases, if the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, targeted treatment.