Left Psoas tightness; lower back pain; buttock pain; difficulty walking; hip pain; This is a spontaneous report received from a Nurse. A 61-year-old female patient (not pregnant) received pneumococcal 20-val conj vac (dipht CRM197 protein) (PREVNAR 20), on 18Jan2025 as dose 1, single (Lot number: LJ5283) at the age of 61 years, in right deltoid for immunisation; elasomeran (MODERNA COVID-19 VACCINE), on 18Jan2025 as dose number unknown, single (Lot number: 8080803), in left arm for covid-19 immunisation. The patient’s relevant medical history and concomitant medications were not reported. The following information was reported: MUSCLE TIGHTNESS (non-serious) with onset 19Jan2025 at 06:00, outcome “not recovered”, described as “Left Psoas tightness”; MUSCULOSKELETAL PAIN (non-serious) with onset 19Jan2025 at 06:00, outcome “not recovered”, described as “buttock pain”; GAIT DISTURBANCE (non-serious) with onset 19Jan2025 at 06:00, outcome “not recovered”, described as “difficulty walking”; ARTHRALGIA (non-serious) with onset 19Jan2025 at 06:00, outcome “not recovered”, described as “hip pain”; BACK PAIN (non-serious) with onset 19Jan2025 at 06:00, outcome “not recovered”, described as “lower back pain”. Therapeutic measures were taken as a result of muscle tightness, back pain, musculoskeletal pain, gait disturbance, arthralgia. Additional information: On 18Jan2025 received co-suspect Moderna 2024-2025 covid vaccine. Unknown if patient took any other medications within 2 weeks of the event starting. All symptoms associated with Left Psoas tightness including lower back pain, hip pain, buttock pain, difficulty walking, no prolonged hospitalization due to it. When asked what treatment received for the adverse event? So far, the pain was still existing as of this date.