carotid arteries were bulging / swollen / still having issues head and neck; spasm in neck / both side of neck (carotid arteries) felt like it was been pushed out / still having issues head and neck; stiff neck / still having issues head and neck; could not lift head / still having issues head and neck /  hold her neck to pick it up; pain is not the same as her arthritis pain /still having the symptoms; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of CAROTID ARTERY DISEASE (carotid arteries were bulging / swollen / still having issues head and neck), MUSCLE SPASMS (spasm in neck / both side of neck (carotid arteries) felt like it was been pushed out / still having issues head and neck), MUSCULOSKELETAL STIFFNESS (stiff neck / still having issues head and neck) and MOVEMENT DISORDER (could not lift head / still having issues head and neck /  hold her neck to pick it up) in a 70-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 018B21A and 048B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Shellfish allergy, Allergy to chemicals and Arthritis.   On 25-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 22-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 10-Apr-2021, the patient experienced CAROTID ARTERY DISEASE (carotid arteries were bulging / swollen / still having issues head and neck) (seriousness criteria medically significant and intervention required), MUSCLE SPASMS (spasm in neck / both side of neck (carotid arteries) felt like it was been pushed out / still having issues head and neck) (seriousness criteria medically significant and intervention required), MUSCULOSKELETAL STIFFNESS (stiff neck / still having issues head and neck) (seriousness criteria medically significant and intervention required), MOVEMENT DISORDER (could not lift head / still having issues head and neck /  hold her neck to pick it up) (seriousness criteria medically significant and intervention required) and PAIN (pain is not the same as her arthritis pain /still having the symptoms). At the time of the report, CAROTID ARTERY DISEASE (carotid arteries were bulging / swollen / still having issues head and neck), MUSCLE SPASMS (spasm in neck / both side of neck (carotid arteries) felt like it was been pushed out / still having issues head and neck), MUSCULOSKELETAL STIFFNESS (stiff neck / still having issues head and neck), MOVEMENT DISORDER (could not lift head / still having issues head and neck /  hold her neck to pick it up) and PAIN (pain is not the same as her arthritis pain /still having the symptoms) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In April 2021, X-ray: abnormal (abnormal) X-ray of  neck and head, the result indicated arthritis..     mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) and mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown Route) dosing remained unchanged.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown Route), the reporter did not provide any causality assessments.   After the 1st dose, the patient woke up on 10-Apr-2021 and could not lift her head. She thought she had stiff neck, she had to hold her neck to pick it up, it felt like her head weighed 100 pounds. It wouldn't go away, she was having lots of pressure on her head, both side of her neck (carotid arteries) felt like it was been pushed out. She got an appointment with her physician, she was told that she was having spasm in her neck. The physician ordered Prednisone and Diazepam for the muscle to calm down, it was getting better. Not long after she had a scheduled appointment with her heart doctor. She was told by her heart doctor that her carotid arteries were bulging, he would like to order a test but they will have to push hard on it so she should wait to get the test done since they are swollen. She later returned to her primary physician who ordered a X-ray of her neck and head. The result indicated arthritis, which was not a new diagnosis because she had had it for years but the pain, she was having was not the same as her arthritis pain.  Based on the information provided which includes a  temporal association between the use of mRNA-1273 vaccine and onset of the reported events, a causal relationship cannot be excluded.   This case was linked to MOD-2021-092219 (Patient Link).; Sender's Comments: Based on the information provided which includes a  temporal association between the use of mRNA-1273 vaccine and onset of the reported events, a causal relationship cannot be excluded.