cramping; difficulty walking/trouble taking the stairs; had plantar fasciitis, she feels severe pain in both of her feet; Fibromyalgia with chronic inflammation/Before the vaccine the patient was at a pain level of 6 or 7 is around a 9 now/also has leg discomfort and pain in extremity/3-5 days after receiving her 1st dose reports having problems with both of legs/feet; numbness; This spontaneous case was reported by a consumer and describes the occurrence of MUSCLE SPASMS (cramping), GAIT DISTURBANCE (difficulty walking/trouble taking the stairs), PLANTAR FASCIITIS (had plantar fasciitis, she feels severe pain in both of her feet), FIBROMYALGIA (Fibromyalgia with chronic inflammation/Before the vaccine the patient was at a pain level of 6 or 7 is around a 9 now/also has leg discomfort and pain in extremity/3-5 days after receiving her 1st dose reports having problems with both of legs/feet) and HYPOAESTHESIA (numbness) in a 57-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 031B21A) for COVID-19 vaccination.     Concurrent medical conditions included Fibromyalgia.    On 29-Jul-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 MUSCLE SPASMS (cramping), GAIT DISTURBANCE (difficulty walking/trouble taking the stairs), PLANTAR FASCIITIS (had plantar fasciitis, she feels severe pain in both of her feet), FIBROMYALGIA (Fibromyalgia with chronic inflammation/Before the vaccine the patient was at a pain level of 6 or 7 is around a 9 now/also has leg discomfort and pain in extremity/3-5 days after receiving her 1st dose reports having problems with both of legs/feet) and HYPOAESTHESIA (numbness). The patient was treated with CORTISONE for Plantar fasciitis, at a dose of 3 shots. At the time of the report, MUSCLE SPASMS (cramping), GAIT DISTURBANCE (difficulty walking/trouble taking the stairs), PLANTAR FASCIITIS (had plantar fasciitis, she feels severe pain in both of her feet), FIBROMYALGIA (Fibromyalgia with chronic inflammation/Before the vaccine the patient was at a pain level of 6 or 7 is around a 9 now/also has leg discomfort and pain in extremity/3-5 days after receiving her 1st dose reports having problems with both of legs/feet) and HYPOAESTHESIA (numbness) outcome was unknown.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       No concomitant medications was reported.  Also patient feet and leg problems still continue to this day and the pain has gotten worse.   Company comment.  This spontaneous case concerns a 57  year  old, female patient with relevant medical history of fibromyalgia, who experienced the unexpected, non  serious ADR of fibromyalgia, among other non  serious events. The event occurred approximately three to five days after the administration of the first dose of mRNA-1273 vaccine. The report stated that the patient experienced leg discomfort, pain in extremity, muscle spasm, hypoaesthesia, gait disturbance and plantar fasciitis, for which she required treatment with cortisone injections. She referred her pain level was 6 or 7 and after the vaccine was around 9. A magnetic resonance imaging was pending. No further details were provided for medical review. Patient´s mentioned medical history could be confounder for fibromyalgia. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.   This case was linked to MOD-2022-558795 (Patient Link).; Sender's Comments: This spontaneous case concerns a 57  year  old, female patient with relevant medical history of fibromyalgia, who experienced the unexpected, non  serious ADR of fibromyalgia, among other non  serious events. The event occurred approximately three to five days after the administration of the first dose of mRNA-1273 vaccine. The report stated that the patient experienced leg discomfort, pain in extremity, muscle spasm, hypoaesthesia, gait disturbance and plantar fasciitis, for which she required treatment with cortisone injections. She referred her pain level was 6 or 7 and after the vaccine was around 9. A magnetic resonance imaging was pending. No further details were provided for medical review. Patient´s mentioned medical history could be confounder for fibromyalgia. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.