If a patient has a cold right leg, the causes are lumbar disc herniation, right leg vasculopathy, femoral joint degeneration, etc., as follows: a. Lumbar disc herniation: after the patient has right nerve root compression and edema, it will lead to abnormal sensation in the right leg and cold symptoms. Second, right leg vascular lesion: for example, there is right lower limb artery stenosis, arteritis, or right lower limb deep vein thrombosis, also easy to trigger the right leg cold symptoms. Third, femoral joint degeneration: middle-aged and elderly people have right leg femoral joint degeneration, such as osteoarthritis, the patient will also feel the right leg cold situation. Therefore, after a patient has a cold right leg, it is important to consult a doctor to see what is causing it. Treating the cause will help to reduce and recover from the symptoms. After the occurrence of coldness in the right leg, it is important to keep the right leg warm, avoid getting cold, and avoid excessive force activities in the right leg to avoid aggravation of symptoms.