This spontaneous case was reported by a consumer and describes the occurrence of PAIN (radiates to the shoulder, back and right breast/pain also radiates down to the right wrist), BREAST SWELLING (right breast swelled, with fluid built up/right breast is significantly larger than his left breast), BACK PAIN (radiates to the shoulder, back and right breast), BREAST PAIN (pain and tenderness on the right breast and nipple/radiates to the shoulder, back and right breast) and NIPPLE PAIN (tenderness on the right breast and nipple) in an 84-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 031M20A and 029K20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below. Previously administered products included for Product used for unknown indication: Flu Shot on 16-Sep-2021. Past adverse reactions to the above products included Urination abnormal NOS with Flu Shot. Concurrent medical conditions included Diabetes, Hypertension, Hyperlipidemia and BPH. Concomitant products included TAMSULOSIN HYDROCHLORIDE (TAMSULOSIN HCL) for BPH, SEMAGLUTIDE (OZEMPIC), GLIMEPIRIDE (GLIPERIDE) and METFORMIN for Diabetes, ATORVASTATIN for Hyperlipidemia, OLMESARTAN for Hypertension.On 19-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 16-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In February 2021, the patient experienced PAIN (radiates to the shoulder, back and right breast/pain also radiates down to the right wrist), BREAST SWELLING (right breast swelled, with fluid built up/right breast is significantly larger than his left breast), BACK PAIN (radiates to the shoulder, back and right breast), BREAST PAIN (pain and tenderness on the right breast and nipple/radiates to the shoulder, back and right breast), NIPPLE PAIN (tenderness on the right breast and nipple), BREAST TENDERNESS (tenderness on the right breast and nipple), ARTHRALGIA (radiates to the shoulder, back and right breast/also radiates down to the right wrist.) and VACCINATION SITE PAIN (developed pain at the injection site). At the time of the report, PAIN (radiates to the shoulder, back and right breast/pain also radiates down to the right wrist), BREAST SWELLING (right breast swelled, with fluid built up/right breast is significantly larger than his left breast), BACK PAIN (radiates to the shoulder, back and right breast), BREAST PAIN (pain and tenderness on the right breast and nipple/radiates to the shoulder, back and right breast), NIPPLE PAIN (tenderness on the right breast and nipple), BREAST TENDERNESS (tenderness on the right breast and nipple) and ARTHRALGIA (radiates to the shoulder, back and right breast/also radiates down to the right wrist.) was resolving and VACCINATION SITE PAIN (developed pain at the injection site) outcome was unknown.  DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available):On an unknown date, Mammogram: normal (normal) Normal.On an unknown date, Ultrasound scan: normal (normal) Normal.For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.Treatment medications were not provided. It was reported that patient received Flu shot on 16-Sep-2021 and experienced increased urination and also reported that pain was recovering after Flu shot.