Below the left ear is the location of the sternocleidomastoid muscle. Most of the pain is caused by a drop pillow or a sprain or contusion of the neck. If the local pain is caused by a drop pillow, it can be treated with manual massage. First use the acupuncture point pressure method, choose Fengchi point, Tianzong point, Tianzhu point, Lijiao point, Quchi point, Hegu point, external Laogong point and other points, thumb point pressure and massage, each point for more than 1 minute, the strength should be moderate. Then use the swinging neck technique, gently and gently shake the neck, slightly let the pain location of the muscle appropriate stretch, and then gradually relax, stimulate the local soft tissue blood circulation, so that the pain symptoms quickly relieve. If the pain is caused by localized sprain and contusion, you can take Shu Tendon and Blood Capsules orally, or use Tao Ren 15 grams, Safflower 15 grams, Angelica Sinensis 12 grams, Chuan Xiong 12 grams, Shu Di 9 grams, Bai Shao 9 grams, decocted for 1 hour and taken orally, and apply Shu Tendon and Blood Cream topically, which can make the pain relieved quickly.