Really sick\sicker than dogs; Breathing very fast; In bed for 3 week; Like he's hyperventilating; Can't catch his breath\like he is hyperventilating\very short of breath; This spontaneous case was reported by a consumer and describes the occurrence of DYSPNOEA (Can't catch his breath\like he is hyperventilating\very short of breath), ILLNESS (Really sick\sicker than dogs) and RESPIRATORY RATE INCREASED (Breathing very fast) in a 35-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 017Z21A and 031BZ1A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concomitant products included ACETYLCYSTEINE (N-ACETYLCYSTEINE), PAROXETINE, LISINOPRIL, METOPROLOL, LEVOTHYROXINE, LORAZEPAM, BUPRENORPHINE and RISPERIDONE for an unknown indication.   On 09-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 12-May-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 12-May-2021, the patient experienced ILLNESS (Really sick\sicker than dogs) (seriousness criterion medically significant). In May 2021, the patient experienced DYSPNOEA (Can't catch his breath\like he is hyperventilating\very short of breath) (seriousness criterion medically significant), RESPIRATORY RATE INCREASED (Breathing very fast) (seriousness criterion medically significant), BED REST (In bed for 3 week) and HYPERVENTILATION (Like he's hyperventilating). At the time of the report, DYSPNOEA (Can't catch his breath\like he is hyperventilating\very short of breath), ILLNESS (Really sick\sicker than dogs), RESPIRATORY RATE INCREASED (Breathing very fast), BED REST (In bed for 3 week) and HYPERVENTILATION (Like he's hyperventilating) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.   No treatment information was not given.  Patient's son received the second dose of Moderna COVID-19 vaccine on 7-May-2021 and now was sicker than dogs, very short of breath, can't catch breath. The patient was living with that type of breathing, like hyperventilating. This has been going on since second Moderna shot.  Right after taking the second dose, patient started feeling really sick and in bed for about 3 weeks. Starting from about a month ago, started breathing very fast. Seen by a physician, but not hospitalized or administered any specific treatment for these symptoms.  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. The company physician considers the reported events as non-serious, because there is no apparent rationale to deal them as serious. Further information has been requested.   This case was linked to MOD-2021-237424 (Patient Link).; 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. The company physician considers the reported events as non-serious, because there is no apparent rationale to deal them as serious. Further information has been requested.