What causes nosebleeds?

Many possibilities. The most common source of a nose bleed is from the front/ bottom part of the nasal septum. This is a vascular area and some people have prominent blood vessels in this area. The blood vessels may break with a nose blow, dryness, or picking at this area. But there are other more serious causes such as hypertension, growth and even a malignancy. See an ENT doctor.
Variety of issues. Lack of humidity such as in winter time with heat turned on. This can dry mucosa and cause nose bleeds. Low platelets as in certain blood diseases can also cause nose bleeds. Any issue that raises blood pressure. As you can see there are a variety of causes.

Related Questions

What causes nosebleeds?

Superficial vessels. 95% of nosebleeds occur from the front of the nose. Blood vessels can be superficial in that area and easily traumatized. This then can lead to bleeding. Bleeding is usually worse when noses are irritated either from an upper respiratory tract infection or allergies. Some people have bleeding disorders which can also make bleeding worse. If nosebleeds are a problem for you you should see an ENT doctor for an evaluation. Read more...
Causes. Nose bleed reasons: nasal congestion or nasal dryness, ^ blood pressure, excessive use of decongestants, being at ^ altitude, trauma to nose, nose picking, or blowing the nose hard. Bacterial ; viral infections can ^ risk as well as bleeding disorders. Recurrent nose bleeds may be due to broken vessel in the nose. Alcohol / Cocaine abuse can cause nose bleeds, as can tumors. Read more...

What causes nosebleeds in pregnancy?

Fragile capillaries. Due to the high estrogen levels in pregnancy, the small blood vessels in our mucous membranes (nasal areas, oral areas) can become fragile and easily irritated --- which is why pregnant women may see nosebleeds or bleeding gums more frequently. Read more...
Vascular dilation. During pregnancy, your blood vessels in your nose to expand, and your increased blood supply puts more pressure on those delicate vessels, especially in the front, causing them to more easily rupture and bleed. Blood vessels can rupture as well in infection with cold, sinus infection, or allergies, when the membranes inside your nose dry out, trauma, high blood pressure or a clotting disorder. Read more...

What causes a nosebleed?

Possible causes. Nose bleed reasons: nasal congestion or nasal dryness, ^ blood pressure, excessive use of decongestants, being at ^ altitude, trauma to nose, nose picking, or blowing the nose hard. Bacterial & viral infections can ^ risk as well as bleeding disorders. Recurrent nose bleeds may be due to broken vessel in the nose. Alcohol / Cocaine abuse can cause nose bleeds, as can tumors. Read more...

What causes random nosebleeds in a child that also bleeds thru mouth?

Best to call your DR. Children who have bleeding disorders that prolong the clotting time can be at risk for excessive bleeding from the nose and mouth. Your doctor can screen for diseases such as hemophilia based on your child's medical history and blood work if medically necessary. Read more...

What can cause continuos nosebleeds?

Prominent vessels. You may have some prominent blood vessels in the very front part of the septum. This region is easy to traumatize with nose picking/blowing nose, etc. If you are having frequent nose bleeds... Get it checked by your local ent. Read more...
Nasal blood vessel. You probably have a large superficial blood vessel inside your nose. You could also have a bleeding disorder or you may be taking a medicine that makes you more prone to bleeding, like aspirin, warfarin, plavix. Large prominent vessels are the most common. Keep the inside of your nose moist with saline and Vaseline. Try a humidifier. If that doesn't work, see an ENT specialist to evaluate. Read more...

What could cause chronic nosebleeds?

Nosebleeds. Some of the causes of frequent nosebleeds include constant exposure to dry air, consistent use of nasal sprays (for allergies or congestion), recurrent upper respiratory tract infections, and snorting drugs, such as cocaine. Sometimes, recurrent nosebleeds can indicate an underlying bleeding disorder. Read more...