Sinha's twin sister, Rakhi, is also a physician, but they chose different specialties.
"I am always in a clinic; she is always in a hospital," Sinha said. "I wanted the full spectrum — to be a real family doctor. You could be stitching a finger on one patient and then be treating someone else for a cold or sending them to the emergency hospital.
"You see everyone — rich, poor, adults, children — and I love the teen population here."
Slight of build, with long dark hair, expressive eyes, and a vibrant smile, Sinha, 30, could pass for a teenager.
She has packed a lot of living in her 30 years — traveling, a medical degree, marriage, motherhood — which perhaps explains her quiet air of confidence and competence.
Sinha and her twin were born in the United States, but their father's job with IBM had them moving all over the world in their early childhood.
"When we were 10, we went to live with our grandparents in India," Sinha said.
They lived there until they joined their parents in the United Arab Emirates where their father had accepted a teaching post at the college for the royal family.
Sinha earned her high school diploma at the International School of Choueifat in Dubai.
She is fluent in English, Hindi, Bengali and gets by with "medical Spanish."
After graduating from high school, the sisters returned to the United States to attend UCI.
"Our parents had read that Irvine was the safest city in America and said you are going there," Sinha said.
Sinha earned a bachelor's degree in anthropology in 2004 and a certificate in ethnomusicology. She was accepted at UCLA's medical school, graduating in 2008. Her sister went to Western Medical School.
While at UCLA, Sinha was involved in research that has been published in medical journals.