his doctor thinks it is a reactionary event of the lymphatic system/lymph nodes; started feeling pain in the armpit; Tendon pulling; Nerve pinching; Unable to extend arm all the way up/Limit on full array of motion of arm; Tendon stretching; Discomfort at the area of vaccine; This spontaneous case was reported by a consumer and describes the occurrence of TENDON INJURY (Tendon pulling), NERVE COMPRESSION (Nerve pinching), VACCINATION SITE DISCOMFORT (Discomfort at the area of vaccine), MOBILITY DECREASED (Unable to extend arm all the way up/Limit on full array of motion of arm) and TENOTOMY (Tendon stretching) in a 44-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 048B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No medical history was reported.     On 19-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 19-Apr-2021, the patient experienced VACCINATION SITE DISCOMFORT (Discomfort at the area of vaccine). On 21-Apr-2021, the patient experienced TENDON INJURY (Tendon pulling), NERVE COMPRESSION (Nerve pinching), MOBILITY DECREASED (Unable to extend arm all the way up/Limit on full array of motion of arm), TENOTOMY (Tendon stretching) and AXILLARY PAIN (started feeling pain in the armpit). On an unknown date, the patient experienced LYMPHATIC DISORDER (his doctor thinks it is a reactionary event of the lymphatic system/lymph nodes). The patient was treated with ACETYLSALICYLIC ACID (ASPIRINE) ongoing since an unknown date at a dose of 325 mg. On 20-Apr-2021, VACCINATION SITE DISCOMFORT (Discomfort at the area of vaccine) outcome was unknown. At the time of the report, TENDON INJURY (Tendon pulling), NERVE COMPRESSION (Nerve pinching), MOBILITY DECREASED (Unable to extend arm all the way up/Limit on full array of motion of arm), TENOTOMY (Tendon stretching), LYMPHATIC DISORDER (his doctor thinks it is a reactionary event of the lymphatic system/lymph nodes) and AXILLARY PAIN (started feeling pain in the armpit) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Ultrasound scan: lymph nodes (Inconclusive) ultrasound taken which showed lymph nodes.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       Patient called and said he took the Moderna COVID-19 vaccine on his left upper arm (Expiration of first dose: 01Jan1900) 3 weeks ago on 19Apr2021 and started feeling discomfort at the area of the vaccine. Caller said he then started feeling pain in the armpit and experienced a feeling of "tendon pulling". Caller said he could not extend arm all the way up. Caller said he went to see a doctor and had ultrasound taken which showed lymph nodes. Caller said lymph node could not been seen by naked eye or be felt by touching. Caller mentioned feeling of pinching nerve as arm is stretched out and could feel tendon stretching and discomfort which put limit on full array of motion of the arm. Caller said this has been going on for 3 weeks and said his doctor thinks it is a reactionary event of the lymphatic system.   This case was linked to US-MODERNATX, INC.-MOD-2021-127956 (E2B Linked Report).; Sender's Comments:  US-MODERNATX, INC.-MOD-2021-127956:Case for patient friend