Nosebleed
A nosebleed or bloody nose was a condition where the capillaries in one's nose burst, causing blood loss. It could be caused by an actual blow to the nose or manifest as a psychosomatic response. The term could also be used as colloquially to describe an embarrassing wound to one's pride.

In 2255 of the alternate reality,  suffered a nosebleed after getting into a fight with  and other Starfleet Academy cadets at the Shipyard Bar. Later, he used wadded-up napkins to stem the flow of blood. (; )

In 2267, Boma suggested giving the Taurus II anthropoids a bloody nose to deter them from attacking the  crew. ()

In 2347, a seven-year-old Worf gave five teenage boys at his school bloody noses. ()

In 2365, Q commented upon Jean-Luc Picard's perceived inability to take a bloody nose, in other words, the loss of eighteen  crew members at the hands of the Borg. ()

In 2371, Lupaza reminisced about the days in which the Shakaar resistance cell would give the Cardassians a bloody nose when they got too close; Shakaar Edon reminded her that sometimes their nose got bloodied. ()

In 2372, Jake Sisko suffered two nosebleeds while under the creative influence of Onaya. She offered him a handkerchief the second time. ()

In 2373, while Keiko O'Brien was possessed by a Pah-Wraith, it made her convulse, which gave her a nosebleed. ()

Later that year, Elim Garak suffered a nosebleed when his mind was linked with Odo, reliving Odo's memories. In this link, Garak was punched in the face by a Cardassian soldier. ()

In 2374, Jadzia Dax, assuming the role of Romulan Proconsul Neral for a hypothetical discussion with Benjamin Sisko, claimed that Dominion incursions into Romulan space to give the Federation a bloody nose didn’t make "her" feel bad. ()

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Medical conditions
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