iStock/elenaleonova Everyone has days when they’re low on energy, but you should feel refreshed after a good night’s sleep or two. If you notice you’re tired every day for more than a month, or experience shortness of breath when you didn’t before, see a doctor, says Dr. Wender. “Most of the time it won’t be cancer, but get it checked because you never know.” Leukemia and lymphoma commonly cause persistent fatigue.
PR Image Factory/Shutterstock If you’re not prone to migraines and never get headaches, but suddenly find yourself popping ibuprofen every day, it could be a brain cancer symptom, which causes pain by pressing on nerves. These are the 21 genius cancer breakthroughs scientists want you to know about.
Blood in the stool
iStock/Sarah Musselman Most likely it’s something benign, like hemorrhoids. But this can be a sign of colon cancer. Cases are increasingly common in people under the age of 50—the age at which colon cancer screening is typically first recommended—Dr. Wender says it’s important to get checked out. “It’s easy to dismiss it as hemorrhoids or constipation, and if the problem comes and goes, people reassure themselves that nothing’s wrong, especially younger people,” he says. “But blood in a bowel movement is never normal, so get it checked out.”