fingernails - toenails stopped growing; very weak nails; severe acid reflux; pain in gums; teeth hurt; body got really acidic; yeast infections; stinging nerve pain; really bad side effects/unusual side effects; extreme cramping in arms/joint; clammy/cold sweat; extreme cramping in joints - arms; This spontaneous case was reported by a patient and describes the occurrence of NAIL GROWTH ABNORMAL (fingernails - toenails stopped growing), ONYCHOCLASIS (very weak nails), GASTROOESOPHAGEAL REFLUX DISEASE (severe acid reflux), GINGIVAL PAIN (pain in gums) and TOOTHACHE (teeth hurt) in a female patient of an unknown age who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. unknown) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Immunocompromised and Lymphatic system neoplasm NOS. Concurrent medical conditions included Drug allergy (Allergic to antibiotics, She states she usually only gets yeast infections when she take antibiotics.).    On 30-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced NAIL GROWTH ABNORMAL (fingernails - toenails stopped growing), ONYCHOCLASIS (very weak nails), GASTROOESOPHAGEAL REFLUX DISEASE (severe acid reflux), GINGIVAL PAIN (pain in gums), TOOTHACHE (teeth hurt), ACIDOSIS (body got really acidic), FUNGAL INFECTION (yeast infections), NEURALGIA (stinging nerve pain), ADVERSE REACTION (really bad side effects/unusual side effects), MUSCLE SPASMS (extreme cramping in arms/joint), COLD SWEAT (clammy/cold sweat) and ARTHRALGIA (extreme cramping in joints - arms). The patient was treated with OMEPRAZOLE (PRILOSEC [OMEPRAZOLE]) for Acid reflux (oesophageal), at a dose of UNK dosage form and VITAMIN 15 for Ingrowing nails, at a dose of UNK dosage form. At the time of the report, NAIL GROWTH ABNORMAL (fingernails - toenails stopped growing), ONYCHOCLASIS (very weak nails), GASTROOESOPHAGEAL REFLUX DISEASE (severe acid reflux), GINGIVAL PAIN (pain in gums), TOOTHACHE (teeth hurt), ACIDOSIS (body got really acidic), FUNGAL INFECTION (yeast infections), NEURALGIA (stinging nerve pain), ADVERSE REACTION (really bad side effects/unusual side effects), MUSCLE SPASMS (extreme cramping in arms/joint), COLD SWEAT (clammy/cold sweat) and ARTHRALGIA (extreme cramping in joints - arms) outcome was unknown.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown Route) was unknown.       She states she was immunocompromised and her lymphatic system was broken before receiving the vaccines. She states that she is experiencing really bad side effects and unusual side effects. She does not know what is going on with her body. She is experiencing: fingernails and toenails stopped growing, very weak nails, severe acid reflux, pain in gums, teeth hurt, body got really acidic, yeast infections, extreme cramping in arms and joints, clammy, cold sweats, blood sugar issues, stinging nerve pain. She has taken Prilosec for acid reflux and is taking nail vitamins for nail growth. She went to the dentist to see if she had gum disease but it was not diagnosed as gum disease. She states she usually only gets yeast infections when she takes antibiotics. She says Moderna needs to know these strange things are happening. Patient consented to follow up: NO   This case was linked to US-MODERNATX, INC.-MOD-2021-155104 (E2B Linked Report).   Reporter did not allow further contact; Sender's Comments:  US-MODERNATX, INC.-MOD-2021-155104:mother case