Dr. Sanjay Gupta in Port-au-Prince hospital.

By Dr. Sanjay Gupta, CNN Medical Chief Correspondent

When I told my wife I wanted to go back to Haiti, she had the reaction I expected. “The girls really missed you when you were gone last time,” she said. “I am worried that you lost too much weight down there,” she added. And, “what about your safety, physical and mental well being?” she concluded. They were all the reactions I expected.

The car was then silent as we were driving through our neighborhood on a rainy Saturday morning. In that quiet, we both realized something essential. I knew she was right, on all counts. And, still, she knew it was the right thing to do. She was the first to speak and break the silence. “Truth is, I would go with you,” she whispered. “I would like to help as well.”

I thought about that conversation a lot on the middle-of-the-night flight to Florida, a connection to Santa Domingo at 3 a.m. and then finally the early morning arrival in Port-au-Prince. She has seen the images on television of the unfathomable suffering over the last month, and she was affected by it in more ways that I realized.

Over the few days I was home, we hardly talked about what I had seen in Haiti. I felt the need to protect her from those stories, some of which I may never share with anyone – and she was cognizant of the desire to not re open the emotional images. She also knew that while I was physically home, my mind never left Haiti.

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Nearly four weeks after the earthquake in Haiti, an amazing rescue.

28-year-old Evan Muncie was pulled from the rubble yesterday where he may have been buried since the quake hit. He was emaciated and severely dehydrated, but alive. So, how did he beat near-impossible odds?

Our chief medical correspondent Dr. Sanjay Gupta is in Port-au-Prince with the incredible story.

You may feel like you're in good shape and the number on the scale may not be anything to worry about. But, new research is showing that just because you have a healthy weight, you may still actually be obese.

Our Dr. Sanjay Gupta joined us on Tuesday's American Morning to explain how this could be possible.

17 days after the earthquake, there's at least one small sign of joy in Haiti – the new lives that have come into this world since the disaster.

Doctors in Port-au-Prince have set up a makeshift maternity ward to care for the newborns and their mothers. They're doing what they can with the supplies they have.

But as our Dr. Sanjay Gupta reports, even with all the challenges these doctors are facing, they haven't given up hope.

Related: Painful plight of Haiti's 'restavek' children

It has become painfully clear in the aftermath of the Haiti earthquake just how desperate the country is for doctors.

For every physician in Haiti there are more than 4,500 potential patients. And to make matters worse, many medical schools have been destroyed.

Our Dr. Sanjay Gupta talked with two Haitian medical students who are facing tough choices and an uncertain future.

Related: Gupta: Calm, dignity inspire in Haiti

Dean Kamen has been called the new Thomas Edison. He's invented more than four-hundred medical devices.

Our Dr. Sanjay Gupta recently traveled to Kamen's idea factory – his home in New England – to check out his latest innovations and to hear some interesting ideas about health care reform.

Program Note: Watch Sanjay Gupta MD, Saturday & Sunday at 7:30 a.m. ET on CNN.

300 full-body scanners will soon be inside airports around the country, but should passengers be concerned about dangerous radiation exposure?

Our Chief Medical Correspondent Dr. Sanjay Gupta joined us on Friday's American Morning to answer your questions about the new security measures affecting your health.

Airport tests new scanners

When it comes to childhood vaccines controversy and confusion have been a big part of the equation for many parents. Now a study by the Centers for Disease Control reveals from 2000 to 2008 the number of kids vaccinated against illnesses like measles, mumps and polio has increased.

Our Chief Medical Correspondent Dr. Sanjay Gupta joined us on Thursday's American Morning to discuss the findings.

With the holiday rush and an attempted terror attack dominating the headlines, health care has taken a back seat. But there is still a lot of work to be done – work that was supposed to be finished by now.

Senators now have to merge their bill with one passed by the House, and the president says he'll be "hands-on" in the process. Our Chief Medical Correspondent Dr. Sanjay Gupta breaks it all down for you.

Dr. Sanjay Gupta and crew found patient zero tucked away in this small mountain village in La Gloria, Mexico

By Danielle Dellorto, CNN

It was late April. I remember it being a somewhat quiet news day when I received the call. It was an editor on our international news desk alerting us that about 100 people had gotten very ill in Mexico City with severe flu-like symptoms.

They had no clue what was causing it at the time. The only thing health officials were telling us was that the patients had contracted a highly contagious virus that hadn’t been seen in humans before. The hunt was on: Dr. Sanjay Gupta and I hopped on the next flight out to Mexico City to track down the mystery virus that was getting so many people so sick.

Within 24 hours of arriving, the dense city of about 8 million people had literally turned into a ghost town. The mayor was urging people to stay inside; the hospitals were overcrowded; schools, public transportation, and restaurants closed their doors. At one point, I remember walking down the unusually empty streets of Mexico City in awe. It was an eerie feeling, but also a defining moment for me as a journalist. I realized that people, not just in Mexico City, were scared of this unknown killer virus. What was it? Would they be infected? What should they do? We didn't know it at the time, but H1N1 influenza was about to become a global epidemic and the world was already looking to us for answers.

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