"Todd and I both had it early on," the "Big Bang Theory" star recently told Jimmy Fallon. "It was like the middle of March. ... We didn't know what it was."
At first, the two weren't too alarmed when they began developing symptoms.
"We thought we had colds," Parsons explained, then noting that something felt very different about their illnesses that let them know they didn't have a simple case of the sniffles.
"We lost our sense of smell and taste," the 47-year-old actor noted, adding that his symptoms "defied the descriptions for me."
"I didn't realize how completely taste and smell could be gone. And when you're in quarantine and there is really nothing to do but eat? That was brutal," Parsons lamented.
When Fallon asked if they experienced a loss of appetite, the "Boys in the Band" star attested that he did "eat everything" in sight, but quipped, "It was the definition of wasted calories."
The couple, who wed in 2017, has since recovered from the coronavirus. Parsons noted that, once they bounced back from COVID-19, they decided to get a little crazy with the hair dye.
"About six weeks in, and we had been sick, I thought, 'Screw it,'" he recalled, revealing he bleached his hair -- with the help of his husband, of course. "Todd did it. It took about six hours and it burned my scalp. But you know what? Beauty is pain."
A loss of taste and smell are commonly associated with COVID-19, according to the Centers for Disease Control and Prevention.