Almost immediately after receiving the second dose, she experienced having no strength or energy/her weakness is severe/ after taking a shower she must lay down to regain her strength/doesn't have the energy to hardly do anything now; Hard for her to complete a shower; Can't hardly stand by the stove to cook/she can hardly keep herself standing up; ongoing cough; Left foot started to swell; Has been going downhill; Blood clot in her left leg; This spontaneous case was reported by a consumer and describes the occurrence of THROMBOSIS (Blood clot in her left leg) in a 68-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Breast cancer (Breast cancer under arm; left side, at the age of 62) in 2015 and Chemotherapy (Stopped chemotherapy treatment during Moderna vaccination series. Restarted after 2 weeks before the time of reporting.) since an unknown date.   On 21-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 24-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 22-Apr-2021, the patient experienced THROMBOSIS (Blood clot in her left leg) (seriousness criterion medically significant). On an unknown date, the patient experienced ASTHENIA (Almost immediately after receiving the second dose, she experienced having no strength or energy/her weakness is severe/ after taking a shower she must lay down to regain her strength/doesn't have the energy to hardly do anything now), LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (Hard for her to complete a shower), DYSSTASIA (Can't hardly stand by the stove to cook/she can hardly keep herself standing up), COUGH (ongoing cough), PERIPHERAL SWELLING (Left foot started to swell) and GENERAL PHYSICAL HEALTH DETERIORATION (Has been going downhill). The patient was treated with RIVAROXABAN (XARELTO) for Anticoagulant therapy, at an unspecified dose and frequency and BENZONATATE for Cough, at an unspecified dose and frequency. At the time of the report, THROMBOSIS (Blood clot in her left leg), ASTHENIA (Almost immediately after receiving the second dose, she experienced having no strength or energy/her weakness is severe/ after taking a shower she must lay down to regain her strength/doesn't have the energy to hardly do anything now), LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (Hard for her to complete a shower), DYSSTASIA (Can't hardly stand by the stove to cook/she can hardly keep herself standing up), COUGH (ongoing cough), PERIPHERAL SWELLING (Left foot started to swell) and GENERAL PHYSICAL HEALTH DETERIORATION (Has been going downhill) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In 2021, Ultrasound scan: abnormal (abnormal) Diagnosed with a blood clot in her left leg..         Patient was given iron injection to regain her energy levels that she lost after the vaccination. It helped her initially but at the time of reporting it was not helping her much. She was prescribed Xarelto for 3 months to treat the blood clot. Patient states that she has no drug or food allergies.  Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded. Very limited information has been reported at this time. Further information is not expected.   This case was linked to MOD-2021-264079 (Patient Link).; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded. Very limited information has been reported at this time. Further information is not expected.