Updated at 5:52 p.m. ET: Actor Dick Van Dyke has been forced to cancel an upcoming public appearance due to a suspected neurological problem.

The 87-year-old star was set to receive the Lifetime Achievement Award for Bettering Humanity through Comedy from New York's 92Y on April 26, but a rep for Van Dyke told Entertainment Tonight that he wouldn't be able to make it due to "fatigue and lack of sleep resulting from symptoms of a yet-to-be diagnosed neurological disorder.”

92Y confirmed the cancellation in a statement to the New York Post.

"Due to a medical condition, Mr. Van Dyke is unable to travel to New York for the program,” the statement read.

There could be more cancellations in the future for the film and television legend. According to his rep, he's currently unable to attend any events requiring air travel.

"This is a guy that never gets sick. ... He doesn't smoke, drink or pop pills," Bob Palmer, Van Dyke's publicist, told NBC News. "Its very frustrating that doctors cannot find out what is going on."

But Van Dyke isn't leaving all of the comments about his condition to his rep. He's looking for answers about his health and reaching out to fans on Twitter for help.

"My head bangs every time I lay down. I've had every test come back that I'm perfectly healthy. Anybody got any ideas?" he wrote on Wednesday.

He later explained that the problem has been going on for seven years and that he's had "every test you can think of (CAT Scan, MRI, Spinal tap etc)," and that he also has "very low blood pressure."

While he's received plenty of feedback from fans, for now his ailment remains a mystery.

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This story was originally published on Thu Apr 18, 2013 10:30 AM EDT

From "Mary Poppins" to "Night at the Museum" and his own long-running TV comedy, Dick Van Dyke has done it all during a show business career spanning seven decades.

Matt Sayles / AP

Dick Van Dyke arrives at the 19th Annual Screen Actors Guild Awards in Los Angeles on Sunday.

On Sunday, Van Dyke, 87, gets a lifetime achievement award from the Screen Actors Guild in Los Angeles, just a year after his 1960s "Dick Van Dyke Show" co-star Mary Tyler Moore received the same honor.

Reuters spoke to Van Dyke about his career, his thoughts on today's comedies and being a newlywed in his 80s.

Q: Was it really as much fun working on "The Dick Van Dyke Show" as it seemed?
A: "It was just absolutely wonderful. (Co-star) Morey Amsterdam used to say it was like going to a party every morning. It was the perfect improv group. I think it was the best five years of all of our lives."

Q: Do you have a favorite episode?
A: "'Coast-to-Coast Big Mouth,' where Mary gives away that Alan Brady, Dick's boss (played by show creator Carl Reiner) is bald, is one that comes to mind. I tend to like the ones that I had the most fun on, and I think the one I recall immediately is 'Where Did I Come From?,' the story of Richie's birth, and all the hijinks that happen with the nervous father. A lot of crazy things happened, a lot of slapstick, which, of course, I love to do. It was a farce, but I just had so much fun on that one."

Q: How have sitcoms changed since "The Dick Van Dyke Show's" run from 1961-66?
A: "I think the big change is that 10 minutes of every 30 are commercials. We had 28 minutes to tell our story. Today they get 20 minutes. It's just a one-line joke and a canned laughter, and a one-line joke and a canned laughter. I won't say it's bad, it's just that I have trouble understanding it.

"It seems to me that relationships are what's missing. I think back to 'All in the Family,' when you knew what those relationships were and the comedy that came out of that. Today it's just one line after another, and they seem to try to cover too much in the way of story in a short time. Then I think they signal when they're trying to be funny, and the minute I catch someone trying to be funny, then I won't laugh."

Q: What do you watch on television?
A: "I have to admit, I don't get the comedies today. Maybe it's just my vintage. Actually I stick pretty much with the news, and I love 'Jeopardy!' I watch Al Jazeera. They have news that you can't find anywhere else. They do great documentaries, too."

Q: Do children tend to recognize you from your earlier roles in film classics such as "Mary Poppins" (1964), or for your more recent work in the 2006 family film "Night at the Museum"?
A: "It's just thrilling. I get little kids who recognize me from 'Mary Poppins,' and it just delights me because it's our third generation. I was in the market the other day and a woman said to her daughter, 'Honey, that's the man who played Bert.' And she ran over to her little brother and said, 'I just met Bert's grandpa!' So to be recognized by kids is just wonderful. Kids have all seen 'Mary Poppins,' almost every family has a copy of it, and the children have come up and sung all the words from the songs of 'Mary Poppins' for me. It's amazing."

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Q: You're a member of the barbershop quartet, Dick Van Dyke and the Vantastix. Where do you perform?
A: "We sing mostly at fundraisers and benefits. We also sing the opening theme song from "The Dick Van Dyke Show." Morey Amsterdam wrote the lyrics, but I don't think they've ever been published. I sing with guys half my age in the group, so they keep me young. A couple years ago we sang at Ford's Theater for the president, so that was a big thrill for us."

Q: You married makeup artist Arlene Silver last February. You two met at the SAG awards seven years ago. How's married life treating you?
A: "Absolutely wonderful! She sings and dances, so there is a lot of that going on around our house. She's a joy and she just lights up my life!"

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Reuters file

At the 2012 Screen Actors Guild Awards, Dick Van Dyke presented the group's lifetime achievement ward to co-star Mary Tyler Moore. This year, it's Van Dyke who will receive the honor.

In a move that confirms the mad affection so many have for Dick Van Dyke, the Screen Actors Guild has decided to give its Life Achievement Award to Van Dyke at the Jan. 27 SAG Awards. On Tuesday, SAG announced that Carl Reiner and Alec Baldwin will present the award to Van Dyke during the televised ceremony.

It'll be a familiar event for Van Dyke. Last year, his "Dick Van Dyke Show" wife, Mary Tyler Moore, was given the honor, with Van Dyke presenting the statue.

Van Dyke's most notable television role just might be on "The Dick Van Dyke Show," which Reiner helped create and co-produced. Before taking on the role of Rob Petrie in 1961, Van Dyke had a prominent Broadway career that included a starring role in the 1959 Broadway production of "Bye Bye Birdie," for which he won a Tony award.

Other career highlights include his role as Bert the chimney sweep in "Mary Poppins," the starring role in "Chitty Chitty Bang Bang," and memorable appearances on "The Carol Burnett Show." More recently Van Dyke, has appeared on the big screen in "Night at the Museum," and starred in "Diagnosis: Murder."

Van Dyke was chosen for the award not just for his work in the arts, but also for his devotion to humanitarian causes. For 20 years he's been a supporter of Los Angeles shelter The Midnight Mission, and he's also been a dedicated fundraiser for National Reye's Syndrome Foundation after losing a granddaughter to that disease.

The SAG awards will air live, coast-to-coast,  at 8 p.m. ET on Jan. 27 on TNT and TBS.

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