Can hot baths cause nosebleeds?

Yes: Some people do experience more nosebleeds with hot baths. Two possible causes: the increase in temperature can dilate the capillaries. This would increase blood flow through all capillaries, including the nose, increasing the chance for a bleed. The other possible explanation is that the mucous membranes of the nose get irritated due to a change in humidity. See your doctor for treatment options.

Probably not: In someone with a normal nose a hot bath won't cause a nose bleed. In someone with a tendency to develop nose bleeds due to enlarged anterior nasal septal blood vessels or inflamed irritated nasal linings anything that angers or upset the nose could lead to increased bleeding. It is possible in those patients the hot water might increase blood flow to the nose and increase the risk of bleeding.