Last year, gold medal–winning Olympic figure skater Scott Hamilton revealed he had been diagnosed with three pituitary brain tumors in a 12-year period—the most recent in August 2016.
Though the news was shocking, Hamilton’s health has since taken a turn that surprised even his doctors. Earlier this year, while undergoing tests in preparation for surgery, his surgeon discovered that the tumor was shrinking, reports this week’s People. “I was on my knees and [my wife] Tracie was in tears,” says Hamilton, 58, grateful for the good news and hopeful that the tumor won’t start growing again.
Hamilton isn’t the only athlete to have experienced a brain tumor. Retired U.S. soccer player Lauren Holiday was sailing through her first pregnancy in the summer of 2016 when suddenly, she began experiencing painful headaches. An MRI revealed a tumor on the right side of the 29-year-old’s brain near her orbital socket, reported the Times-Picayune.
Fortunately, the two-time Olympic gold medalist’s growth was benign, operable, and not a risk to Holiday’s daughter. More good news: brain tumors are pretty rare. You have just a 1% chance of developing a malignant brain tumor in your lifetime, according to the American Cancer Society.
Here, a neurosurgeon reveals more facts to know about brain tumors:
Headaches can be a symptom, but don’t freak out
The next time you get a piercing headache, don’t jump to any conclusions. The ones brought on by brain tumors aren’t your average headaches, says John G. Golfinos, MD, chair of the department of neurosurgery and co-director of the Brain Tumor Center at NYU Langone Medical Center. They’re persistent, and tend to be worse in the morning and improve throughout the day. “That’s because when people are lying flat, the pressure in the skull and brain goes up, and during the day some of the pressure starts to go away,” he explains. What’s more, brain tumor headaches are often associated with nausea and vomiting.
Not all brain tumors are cancerous
“There’s a whole spectrum and range of outcomes for brain tumors,” says Dr. Golfinos. As in Hamilton’s and Holiday’s cases, some are benign, “which means they grow very slowly in the brain or just outside the brain,” he explains. Others are malignant, grow very quickly, and are incurable.
Even benign tumors can cause major issues
The reason brain tumors can be so risky is that the skull is a thick, confined space: “So anything that grows inside or just outside the brain can take up a lot of room and press on important parts of the brain, causing a lot of problems,” he says. “That’s why we say with brain tumors, it’s not just what type of tumor is it, but where is it.”
The problems can include loss of vision, difficulties with speech, issues understanding language, or weakness on one side of the body. Symptoms can be subtle in the beginning, especially if they’re caused by a benign, slow-growing tumor, says Dr. Golfinos. But if you notice any of those changes, it’s a good idea to see your doctor.
Brain tumors can’t escape your skull
Brain tumors are unique in that they can’t spread to other organs, since they don’t have the same access to the blood stream that tumors in other parts of the body do, says Dr. Golfinos. “The brain itself is a very privileged part of the body,” he notes. “It’s good at keeping things out, but also good at keeping things in.”
Your phone won’t cause a tumor
You may have heard the myth that constantly talking on your cell causes cancer. According to Dr. Golfinos, you have nothing to worry about, since there’s no good evidence to suggest this is true. The reality, he says, is that “[w]e really don’t understand what causes brain tumors.”
You can’t prevent tumors from developing
“Many people ask me if there’s anything they can do to avoid brain tumors,” says Dr. Golfinos. “And right now the answer to that is ‘no.’” That said, to play it safe, Dr. Golfinos recommends avoiding exposure to excess radiation whenever possible (by opting for an MRI over a CT scan for example), especially for anyone under the age of 18.
This article originally appeared on Health.com