Immune system went into overload after the 2nd shot; Fatigue; Brain Fog; Joint ache; Body aches; Shortness of breath; Feeling more chest pressure; ache; Fever; Headache; Nauseous; Long haulers symptoms; Long Haulers symptoms; This spontaneous case was reported by a nurse and describes the occurrence of COVID-19 (Long Haulers symptoms), POST-ACUTE COVID-19 SYNDROME (Long haulers symptoms), DYSPNOEA (Shortness of breath), CHEST DISCOMFORT (Feeling more chest pressure) and IMMUNE SYSTEM DISORDER (Immune system went into overload after the 2nd shot) in a 63-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 043L20H and 037k20a) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included COVID-19 (Long hauler with additional side effects.) in July 2020. Concomitant products included PROGESTERONE (PROMETRIUM [PROGESTERONE]), TESTOSTERONE and PARACETAMOL (TYLENOL) for an unknown indication.   On 06-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 02-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In July 2020, the patient experienced COVID-19 (Long Haulers symptoms). On 10-Nov-2020, the patient experienced POST-ACUTE COVID-19 SYNDROME (Long haulers symptoms). On 03-Feb-2021, the patient experienced PAIN (ache), PYREXIA (Fever), HEADACHE (Headache) and NAUSEA (Nauseous). On 20-Feb-2021, the patient experienced DYSPNOEA (Shortness of breath), CHEST DISCOMFORT (Feeling more chest pressure), FEELING ABNORMAL (Brain Fog), ARTHRALGIA (Joint ache) and MYALGIA (Body aches). On an unknown date, the patient experienced IMMUNE SYSTEM DISORDER (Immune system went into overload after the 2nd shot) and FATIGUE (Fatigue). At the time of the report, COVID-19 (Long Haulers symptoms), POST-ACUTE COVID-19 SYNDROME (Long haulers symptoms), DYSPNOEA (Shortness of breath), CHEST DISCOMFORT (Feeling more chest pressure) and IMMUNE SYSTEM DISORDER (Immune system went into overload after the 2nd shot) had not resolved, PAIN (ache), FEELING ABNORMAL (Brain Fog), ARTHRALGIA (Joint ache), MYALGIA (Body aches), PYREXIA (Fever), HEADACHE (Headache) and NAUSEA (Nauseous) had resolved and FATIGUE (Fatigue) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Concomitant medication also included Vitamin C, D , B. Treatment information was not provided. Patient still have Long haulers symptoms, Shortness of Breath, Feeling more chest pressure, Fatigue, Body/Joint aches symproms. Her pulmologist  thinks that her immune system went in to overload after the 2nd dose because she was already having long haulers symptoms when she received first shot and also told that with time the immune system will get stronger and vaccine goes down in to the system.All the medical tests were Normal and there was no damage to lungs and heart. But patient still have symptoms.  Most recent FOLLOW-UP information incorporated above includes: On 29-Jul-2021: Follow-up information included email of reporter, added event Joint ache, Brain fog, covid long haulers, immune system overload, Updated event outcome,  updated the patient initial.