Nosebleeds are common in horses. The severity of a nosebleed depends on how frequently it occurs and the amount of blood lost. A single nosebleed with a small amount of blood loss is generally not of medical concern. Some conditions, such as guttural pouch mycosis, can lead to significant blood loss, and may be fatal. Horses with a consistent nosebleed, repeated episodes of nosebleeds, or losing large amounts of blood require immediate medical attention.
Nosebleeds in horses may be caused by conditions affecting both upper or lower airways.
Nosebleeds may also be idiopathic, without an obvious cause.
Thoroughbreds and older horses are more susceptible to nosebleeds.
Nosebleeds may be chronic or acute, consistent or inconsistent, and have a light or heavy flow depending on the underlying condition. The position of a horse’s head may also influence blood flow.
Horses are more likely to bleed out of one nostril if the upper respiratory tract is affected, or both if the lower tract is affected.
An underlying condition such as GPM may result in profound blood loss indicating arterial damage, which differs from trickles of blood associated with a minor injury.
Treatment depends on the underlying cause, and may include surgery, radiation therapy, antibiotics, or sinus draining. Recurrent treatment and multiple follow-up appointments to track recovery may be necessary.
Nosebleeds may be mistaken for other nasal discharge. Horses that have injuries elsewhere on their body may rub or itch the injury with their nose, resulting in blood spots that may resemble a nosebleed.