Former Pittsburgh Steelers linebacker Anthony Chickillo was tased by cops at a hospital this week … after police say he had a breakdown inside of a doctor’s office.

According to the Hialeah Police Department, Chickillo was at the Hialeah Hospital in Hialeah, Fla. on Thursday morning … when witnesses say he suddenly snapped and began “trashing” an office, breaking things and throwing chairs.

Cops say the former football player then allegedly “tried to attack everybody” — before he got into a wrestling match with his dad.

Bystanders called 911 — and when officers arrived on scene, we’re told they deployed a taser in order to subdue him.

In video obtained by TMZ Sports, you can see 30-year-old Chickillo was barefoot and shirtless as cops finally got him in handcuffs and took him away from the area.

The HPD tells us, though, Chickillo was not arrested … and instead was placed on a 72-hour psychiatric hold.

We’re told he will not be arrested once he’s released either because nobody at the doctor’s office wanted to press charges.

Chickillo is not a stranger to run-ins with the law. In 2019, he was arrested for allegedly roughing up his girlfriend. The charges were ultimately dropped, however, after prosecutors said she refused to testify against him.