Many had been wondering what was wrong with the 72-year-old coach after he had been spotted in public multiple times this week with an eyeball seemingly full of blood.

Pat McAfee even joked with the Alabama honcho during his appearance on the "Pat McAfee Show" early Thursday morning -- asking if the seven-time national champion had suffered an injury squatting too much.

Initially, Saban said he had no idea what was wrong ... but during his hit on his weekly radio show on Thursday night, he announced it was simply a wound he got from yelling at his Crimson Tide players.

"[The doctor] comes to see me after practice today," Saban said. "And, he looks at me and he said, 'You been coughing?' And I said, 'No.' And he said, 'You know, you can get this from yelling.'"

"He said, 'You got it from yelling. There's nothing wrong with you. You just got it from yelling. You busted a blood vessel in your eye from yelling too much.'"

Saban and his cohosts got in a good laugh over it all ... with Nick even joking of his appearance, "It looks like I've been in a gang fight and my gang didn't show."

Saban should be fine going forward ... as the Mayo Clinic describes the issue as a "harmless" one that should subside in just a few days.