Weakness and stiffness in numerous muscles / in the upper arm there is lot of weakness; Some sort of neurological response; Weakness and stiffness in numerous muscles; Limited range of motion especially in left upper arm and shoulder; Tightness in his thighs in his sleep; when he gets the flu he would have mild tightness; Pain has become a nuisance slightly debilitating / Loss of energy; Walks slower,Takes more time to get in and out of the car; Getting his clothes on is difficult and takes more effort / Difficulty carrying things; muscular Pain has become a nuisance /Painful and difficult when he is reaching with his left arm (pain is in the upper arm muscle); Achiness in hip and knee; This spontaneous case was reported by a consumer and describes the occurrence of MUSCULAR WEAKNESS (Weakness and stiffness in numerous muscles / in the upper arm there is lot of weakness), NEUROLOGICAL SYMPTOM (Some sort of neurological response), MUSCULOSKELETAL STIFFNESS (Weakness and stiffness in numerous muscles), HYPOKINESIA (Limited range of motion especially in left upper arm and shoulder) and MUSCLE STRAIN (Tightness in his thighs in his sleep) in a 74-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 011M20A and 002B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 15-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 15-Mar-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 MUSCULAR WEAKNESS (Weakness and stiffness in numerous muscles / in the upper arm there is lot of weakness), NEUROLOGICAL SYMPTOM (Some sort of neurological response), MUSCULOSKELETAL STIFFNESS (Weakness and stiffness in numerous muscles), HYPOKINESIA (Limited range of motion especially in left upper arm and shoulder), MUSCLE STRAIN (Tightness in his thighs in his sleep), INFLUENZA (when he gets the flu he would have mild tightness), ASTHENIA (Pain has become a nuisance slightly debilitating / Loss of energy), GAIT DISTURBANCE (Walks slower,Takes more time to get in and out of the car), LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (Getting his clothes on is difficult and takes more effort / Difficulty carrying things), MYALGIA (muscular Pain has become a nuisance /Painful and difficult when he is reaching with his left arm (pain is in the upper arm muscle)) and ARTHRALGIA (Achiness in hip and knee). At the time of the report, MUSCULAR WEAKNESS (Weakness and stiffness in numerous muscles / in the upper arm there is lot of weakness), NEUROLOGICAL SYMPTOM (Some sort of neurological response), MUSCULOSKELETAL STIFFNESS (Weakness and stiffness in numerous muscles), HYPOKINESIA (Limited range of motion especially in left upper arm and shoulder), MUSCLE STRAIN (Tightness in his thighs in his sleep), INFLUENZA (when he gets the flu he would have mild tightness), ASTHENIA (Pain has become a nuisance slightly debilitating / Loss of energy), GAIT DISTURBANCE (Walks slower,Takes more time to get in and out of the car), LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (Getting his clothes on is difficult and takes more effort / Difficulty carrying things), MYALGIA (muscular Pain has become a nuisance /Painful and difficult when he is reaching with his left arm (pain is in the upper arm muscle)) and ARTHRALGIA (Achiness in hip and knee) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Weight decreased: 185 (Inconclusive) 185 Pounds.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Concomitant product details was not reported.  Treatment details was not reported .  Patient stated that he got two shots of vaccine and for first dose he got neurological response, flu like symptoms, muscle pains, stiffness and daily activity impairments.  Patient also stated that he lost about 15 pounds weight which is not usual for him.