The most common causes of cold discomfort in the right arm are low environmental temperature, cervical spondylosis, vascular lesions, and local nerve damage. 1. Low ambient temperature: If the surrounding environment is too low or the patient is thinly dressed, the soft tissues of the right arm are stimulated by cold, and it is easy to have cold discomfort, usually after paying attention to warmth, the symptoms can be relieved. 2. Cervical spondylosis: If the patient has cervical spondylosis, the protruding intervertebral disc compresses the nerves, which will easily cause numbness of the upper limbs, and the local area may also have a cold and uncomfortable feeling. 3. Vascular lesions: If the patient’s right arm has a blood clot, resulting in poor local blood flow, it may also cause a cold feeling in the arm. 4. Local nerve damage: If the patient’s right arm has been traumatized, the local nerve tissue has been damaged, there may also be sensory abnormalities, and there may be a cool uncomfortable feeling in the right arm. The cause of the right arm cool discomfort is more reasons, may also be related to fasciitis and other reasons, if the symptoms are not relieved after rest, it is recommended to promptly go to the hospital to find out the cause of the disease, by the doctor targeted treatment.