The main symptoms of a blocked meridian in the arm are pain, swelling, unfavorable activity, and numbness.1. Pain, as Chinese medicine says, is painful when it does not pass, and a blocked meridian can lead to stagnation of blood and stagnation of Qi, resulting in significant pain.2. Swelling, because after a meridian injury, there is blood away from the meridian, which gradually forms stagnant blood and produces swelling.3. In addition, the inflammatory edema formed after the gradual formation of local inflammation will also aggravate the swelling. 3, unfavorable activity, after the appearance of meridian inaccessibility, when carrying out activities, it will lead to further stimulation of the inflammatory parts, which will lead to further aggravation of inflammatory edema, further increase of pain, resulting in inflexible activities, pain significantly increased during activities. 4, numbness, mainly due to meridian inaccessibility After that, the nerves are stimulated, resulting in pressure on the nerve sheath and nerve bundle membrane, and numbness can occur.