Fifteen-year-old Calvino Inman, of Rockwood, Tenn., appears to have a bizarre medical condition that doctors can't seem to explain with any degree of certainty.
He cries tears of blood.
Inman says he has cried blood for three months, up to three times a day.
So, what's the reason for his condition?
Experts are stumped. Despite visiting several doctors, and undergoing several tests, including Computed Tomography (C.A.T.) scans, Magnetic Resonance Imaging (MRI) and Ultrasound tests, doctors can't say for sure what's causing the bleeding.
CBS News medical correspondent Dr. Jennifer Ashton said on "The Early Show" Monday, doctors are theorizing the condition could be haemolacria, a type of bloody tear condition, which reportedly affects one in a million people.
Ashton said what's perplexing about Inman's case is that the tears are affecting both eyes.
"Usually," she said, "it's would be more plausible occurring with just one eye."
Doctors haven't been able to find anything, Ashton said. However, she added, in medicine, it's as important to know what something isn't because that could lead to further clues about the condition.