interstitial cystitis; feeling very sick in the morning; After not much sleep; projectile vomiting; shaking and teeth chattering; impossible to eat w/out vomiting / She couldn't eat or; she had all over excruciating pain; UTI; extreme back pain; weak legs and unsteady/ very unsteady; arm was sore at the site; aching head to feet, body that had ever been in pain was more painful; rigor chills, teeth chattering; Nauseated; cytokine reaction; headache; sick to her stomach; dizziness/; This spontaneous case was reported by a consumer and describes the occurrence of CYTOKINE STORM (cytokine reaction) in a 79-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Cystitis interstitial from 1996 to 1999.   On 05-Mar-2021, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On an unknown date, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 06-Mar-2021, the patient experienced CYTOKINE STORM (cytokine reaction) (seriousness criterion medically significant), ABDOMINAL DISCOMFORT (sick to her stomach), DIZZINESS (dizziness/), HEADACHE (headache) and NAUSEA (Nauseated). On an unknown date, the patient experienced CYSTITIS INTERSTITIAL (interstitial cystitis), MALAISE (feeling very sick in the morning), INSOMNIA (After not much sleep), VOMITING PROJECTILE (projectile vomiting), TREMOR (shaking and teeth chattering), FEEDING DISORDER (impossible to eat w/out vomiting / She couldn't eat or), PAIN (she had all over excruciating pain), URINARY TRACT INFECTION (UTI), BACK PAIN (extreme back pain), MUSCULAR WEAKNESS (weak legs and unsteady/ very unsteady), VACCINATION SITE PAIN (arm was sore at the site), MYALGIA (aching head to feet, body that had ever been in pain was more painful) and CHILLS (rigor chills, teeth chattering). At the time of the report, CYTOKINE STORM (cytokine reaction), CYSTITIS INTERSTITIAL (interstitial cystitis), MALAISE (feeling very sick in the morning), INSOMNIA (After not much sleep), VOMITING PROJECTILE (projectile vomiting), TREMOR (shaking and teeth chattering), FEEDING DISORDER (impossible to eat w/out vomiting / She couldn't eat or), ABDOMINAL DISCOMFORT (sick to her stomach), DIZZINESS (dizziness/), PAIN (she had all over excruciating pain), URINARY TRACT INFECTION (UTI), BACK PAIN (extreme back pain), MUSCULAR WEAKNESS (weak legs and unsteady/ very unsteady), VACCINATION SITE PAIN (arm was sore at the site), HEADACHE (headache), MYALGIA (aching head to feet, body that had ever been in pain was more painful), CHILLS (rigor chills, teeth chattering) and NAUSEA (Nauseated) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Body temperature: 100.6 degree Celsius (High) 100.6 and 99.1 degree Celsius (High) 99.1.         Relevant concomitant medications were not reported. Treatment information was not provided.  Patient visited her cardiologist and primary care doctors and they reported good strong immune response. Patient also visited oncologist; he reported cytokine reaction.  Patient also had a medical history of interstitial cystitis for 3 years but again she developed interstitial cystitis after the 2nd dose.  Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.   Most recent FOLLOW-UP information incorporated above includes: On 11-Jul-2021: Additional information received on 10-JUL-2021 regarding the 2nd Dose events and lab data. On 12-Jul-2021: Follow-up information received on 12-JUL-2021 contains updated event onset date.; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.