Swelling of the left cheek and neck joint may be caused by physiological factors such as pillow fall, cold, long time head down, etc., or it may be caused by pathological factors such as cervical spondylosis and fasciitis. 1. Physiological factors: due to factors such as pillow fall, getting cold or prolonged head down, which can lead to the neck muscles in a state of tension, there will be muscle strain, which is manifested as swelling of the soft tissues around the neck and pain when moving. 2. Cervical spondylosis: cervical spondylosis is based on cervical spine degenerative lesions, long-term strain, osteophytes and so on, leading to cervical spinal cord, nerve root compression and a series of symptoms, early symptoms can be manifested as neck pain and swelling, and in severe cases, it can also cause pain and numbness of the upper limbs and other symptoms. 3. Fasciitis: Fasciitis is an aseptic inflammation that occurs in the fascia area due to trauma, chronic strain injury, etc. Inflammatory stimuli can lead to localized soreness, stiffness, swelling and other symptoms. The swelling of the left cheek and neck joint may have other causes, and it is recommended that the patient consult the hospital in time for examination and standardized treatment for the cause of the disease.