Medically reviewed by Susan Bard, MD A black line on the nail could be normal, such as when it is just a color variation.

Splinter hemorrhages could be a sign of a serious health concern called endocarditis. Endocarditis is an infection in the heart chambers and valves. It can occur if fungi, bacteria, or other germs ...

We compared the clinical course of 68 patients with infective endocarditis and mycotic aneurysm ... 57% had subarachnoid hemorrhage without warning. Forty-three percent had a neurologic prodrome ...