Cold and swollen legs should be treated according to different causes, such as physiological factors, muscle strain, lumbar disc herniation, lower extremity venous thrombosis and other causes. 1. Physiological factors: for example, feeling wind and cold or sitting or standing for a long time will lead to cold and swollen calf muscles, which can be alleviated by keeping warm or appropriate activities. 2. Muscle strain: In this case, it is recommended that the patient rest for 3-5 days, avoid strenuous exercise, local massage can be performed to relax the local muscles, can also be performed hot compresses or ultra-short wave physiotherapy to improve local circulation, can be followed by the application of diclofenac diethylamide cream, to alleviate the feeling of bloating. 3. Lumbar disc herniation: apply lumbar traction, acupuncture, intermediate frequency pulse electro-physiotherapy, or oral nutritional nerve drugs, such as methylcobalamin dispersible tablets, conservative treatment. If conservative treatment is ineffective, the intervertebral disc can be removed by intervertebral foramenoscopy surgery. 4. Lower extremity venous thrombosis: for such patients, you can follow the doctor’s instructions to apply anticoagulant drugs, such as subcutaneous injection of low molecular heparin sodium, if the application of drugs is ineffective, then follow the doctor’s instructions to carry out interventional thrombosis surgery. There are many reasons for the cold and swollen legs, if the patient is still not better after resting, it is recommended that the patient go to a regular hospital for further treatment.