body aches; temperature on 08JAN2021 was 100.2; headache; palpitations; blood pressure was 200/109; heart rate which was 130; chest and neck was red; rashes on both arm; left arm in the evening was soo stiff up to her elbow; developed a lymph node in her left armpit; A spontaneous report was received from a 62-years-old, female nurse, who was also the patient, who received Moderna's COVID-19 vaccine (mRNA-1273) and experienced palpitations, blood pressure was 200/109, heart rate which was 130, chest and neck was red, rashes on both arms, left arm in the evening was so stiff up to her elbow, body aches, developed a lymph node in her left armpit, temperature on 08JAN2021 was 100.2, and headache.   The patient's medical history included being diabetic. Products known to have been used by the patient, within two weeks prior to the event, included sitagliptin metformin, clonidine, losartan, repaglinide, rosuvastatin, and glimepiride.    On 07 Jan 2021 at 08:05, approximately 20 minutes prior to the onset of the symptoms, the patient received their first of two planned doses of mRNA-1273 (Lot number: Unknown) for prophylaxis of COVID-19 infection.   On 07 Jan 2021, 20 minutes after receiving the vaccine, the patient felt palpitations. She checked her blood sugar due to her being diabetic, which was okay. The palpitation was going faster, her chest and neck were red, and she felt like she was choking from the palpitation. The patient returned to where the vaccine was administered where her heart rate was found to be 130 and her blood pressure was 200/109. She had small pin-point rashes on both arms. She was taken to the emergency on 07 Jan 2021 where she had blood work done, and she was given 500CC of normal saline and was released the same day. The rashes on her arms faded on Thursday (07 Jan 2021), and her left arm in the evening was so stiff up to her elbow. She also developed a lymph node in her left armpit. Her temperature was 100.2 on 08 Jan 2021 and she took a paracetamol. The patient had body aches and a headache starting on Friday (08 Jan 2021) up until Saturday (09 Jan 2021). Treatment for the events included 500CC of normal saline and paracetamol.   Action taken with mRNA-1273 in response to the events was unknown.  The outcome of the events palpitations, blood pressure was 200/109, heart rate which was 130, chest and neck was red, left arm in the evening was so stiff up to her elbow, developed a lymph node in her left armpit, and temperature on 08JAN2021 was 100.2 was unknown. The event rashes on both arms was considered recovered/resolved on 07 Jan 2021, and the events body aches and headache were considered recovered/resolved on 09 Jan 2021.; Reporter's Comments: This spontaneous report refers to a case of a 62-year-old female patient with medical history of diabetes, who experienced serious events of palpitations and blood pressure 200/109 and non-serious events of heart rate was 130, chest and neck was red, rashes on both arms , left arm in the evening was soo stiff up to her elbow, body aches, lymph node in her left armpit, and headache  20 minutes after the administration of the first and only dose of mRNA-127 (Lot number unknown, Exp date-unknown). Normal saline was administered, and the patient was released the same day   The patient also experienced elevated temperature of 100.2, 1 day after vaccine administration.  Based on temporality and the absence of any other etiology factors, a causal association between the events and vaccine administration cannot be excluded