Pain on the left side of the neck is referred to spine surgery and ENT. Most of the pain is caused by poor posture or habits, reduce activities and rapid head turning, avoid overexertion, pay attention to rest, and correct poor working posture, such as low posture, bending over too long. You can also consider seeing the ENT department to have an ultrasound of the lymph nodes in the neck to clarify whether there is localized lymph node enlargement causing pain, and a laryngoscopy to observe whether there are other lesions in the larynx. If the patient has unilateral inflammation of the lymph nodes in the neck, consider applying swelling and pain capsule with Pudilan anti-inflammatory oral solution to observe the change of the condition. If the patient is considered to have inflammation in the throat, involving the lymph nodes in the neck, consider applying cefprozil tablets or amoxicillin capsules for anti-inflammatory purposes, and clarify whether there is any history of allergy to cephalosporin and penicillin before using the medication to avoid allergic reactions and closely observe the changes in the condition.