The causes of neck swelling are as follows: 1. Neck muscle, fascia and ligament strain and cold, mostly seen in people who spend a long time looking down at their cell phones or playing with computers, or who spend a long time with their heads down or working at a desk, can easily lead to neck swelling. 2. Patients with lymphadenitis in the neck are also prone to neck swelling discomfort. 3. 4. Patients with straightened cervical spine curvature or hyperflexia will also have a swollen neck. After a patient has a swollen neck, he or she must consult a doctor to see what causes it and treat the cause to promote symptom reduction and recovery and restore normal neck force and activity.