Has preexisting arthritis and her hands have tendency to curl up, feels tightness around ankles and toes will curl under at night; Says at night her hands and feet curl  legs get stiff at night/tightness around the ankel; "toes feel swollen but are not"; This spontaneous case was reported by a consumer and describes the occurrence of ARTHRITIS (Has preexisting arthritis and her hands have tendency to curl up, feels tightness around ankles and toes will curl under at night), JOINT STIFFNESS (Says at night her hands and feet curl  legs get stiff at night/tightness around the ankel) and SWELLING ("toes feel swollen but are not") in a 90-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 11A021A and 011A21A) for COVID-19 vaccination.     Concurrent medical conditions included Arthritis.   On 03-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 07-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On an unknown date, the patient experienced ARTHRITIS (Has preexisting arthritis and her hands have tendency to curl up, feels tightness around ankles and toes will curl under at night), JOINT STIFFNESS (Says at night her hands and feet curl  legs get stiff at night/tightness around the ankel) and SWELLING ("toes feel swollen but are not"). At the time of the report, ARTHRITIS (Has preexisting arthritis and her hands have tendency to curl up, feels tightness around ankles and toes will curl under at night), JOINT STIFFNESS (Says at night her hands and feet curl  legs get stiff at night/tightness around the ankel) and SWELLING ("toes feel swollen but are not") had not resolved.            Concomitant medication included blood thinner and thyroid pill Treatment medication was not provided. Patient stated preexisting arthritis and patient hands have tendency to curl up. "When patient get up in the morning, " Says at night patient hands and feet curl and legs get stiff at night.  Patient felt tightness around ankles and toes will curl under at night.  stated the "toes feel swollen but are not" Says this has been ongoing since receiving the 2nd dose.  Company comment: This case concerns a 90-year-old, female patient, with medical history of Arthritis, who experienced the non-serious, unexpected events of Arthritis (AESI), joint stiffness, and swelling. The events occurred  on unknown date after second dose of mRNA 1273 vaccine. The patient has pre-existing arthritis, after the second dose patient felt stiffness of her hand, legs and feet and has a feeling of swelling, no treatment information was given. The rechallenge is not applicable as  events have not resolved. The patient's age and current illness of arthritis remain as confounders to the events.  The benefit-risk relationship of mRNA 1273 vaccine is not affected by this report.; Sender's Comments: This case concerns a 90-year-old, female patient, with medical history of Arthritis, who experienced the non-serious, unexpected events of Arthritis (AESI), joint stiffness, and swelling. The events occurred  on unknown date after second dose of mRNA 1273 vaccine. The patient has pre-existing arthritis, after the second dose patient felt stiffness of her hand, legs and feet and has a feeling of swelling, no treatment information was given. The rechallenge is not applicable as  events have not resolved. The patient's age and current illness of arthritis remain as confounders to the events.  The benefit-risk relationship of mRNA 1273 vaccine is not affected by this report.