A psychotherapist on Fox News this weekend claimed he’s witnessing a huge hike in Donald Trump-related distress and anxiety among patients who attend his practice.

New York City-based Jonathan Alpert stressed at the start of his “Sunday Briefing” interview with anchor Peter Doocy that so-called “Trump Derangement Syndrome” — the partisan insult that top Republicans often like to lob at anyone who dares to criticize anything about the president ― is not a real medical diagnosis.

But the emotional fallout that some of his patients are experiencing, which is linked to their fury with Trump, is very real and something he is “deeply, deeply concerned about,” he said.

“We see great division in families and friendships broken up over how someone may feel about Trump,” noted Alpert, who last week penned an essay for The Wall Street Journal in which he admitted that “no therapist would render such a derogatory and partisan diagnosis, but I’ve seen it in my practice.”

“What I’m seeing is symptoms that in many ways mirror other disorders,” Alpert said on Fox. “So, people are highly anxious, they’re angry. They can’t sleep. One person even said she couldn’t possibly enjoy a family vacation as long as Trump is out there. These are hallmark features of any disorder that I treat every day of the week, and we should really be concerned about this.”

Alpert said he’d “even go so far as to call this a mental health epidemic, and in some ways the defining pathology of the past decade.”

To assist patients angry with serial untruth-teller Trump, he said he tries to help people “separate fact and fiction, understand that some of their thoughts may not be rooted in fact.”

“I have some patients who, within 30 seconds, will talk about Trump and that dominates the session,” he revealed. “Other people are just anxious and depressed, and then we find out it’s because they’re fixated, hyperfixated on Trump. So really, Trump dominates probably about three-quarters of the sessions of the patients that I have.”

Watch the full interview here: