Send this link to your favorite guy—after you read it. You may notice one of these red flags long before he does.
Always ask a health care professional about your specific medical needs. This information is not individual medical advice and may not be appropriate for you.
How it feels to him: "They think it's a pimple or a mole, and some men keep hitting it with their razor, making it bleed each time," says dermatologist Whitney Bowe, M.D., of Mount Sinai Hospital in New York City. "Others complain of a new scratch or scar they don't remember getting."
Why he needs a doc: That mystery pimple could be basal cell carcinoma, a treatable form of skin cancer that strikes men more than women, possibly up to twice as often, according to the American Cancer Society. Help track other hot spots—scalp, eyelids, tips of ears, and back—especially if your guy is outdoors a lot (paging golfers and lawn care lovers!). Basal cell doesn't tend to metastasize quickly the way melanoma does, but the longer you delay removing it, the more disfiguring your scar can be. "When we see it in men," says Bowe, "it's usually further along, because they've waited to come in."
How it feels to him: He suddenly has to get up more than once a night to pee or feels as if he needs a revolving bathroom door during the day; his stream is weaker; or he says it's painful to urinate.
Why he needs a doc: An enlarged prostate is often to blame; it eventually happens to half of all men. Some guys can get away with doing nothing, but others need meds to cut discomfort. Less often, men require surgery to prevent blockage complications like kidney damage, says urologist Ryan Berglund, M.D., of the Cleveland Clinic. A troubled flow can also signal issues including diabetes or, in rare cases, prostate cancer.