To echo what Crip and Eagle said, a lot of what causes a nose bleed is environmental. How dry the air is, pollutants, pollens, repeated picking/blowing ect. ect., but one other contributing factor could be....are you a smoker? Smoking can greatly increase the dryness factor in your nasal passages, which could lead to your nose bleeds.
One other factor that you might want to look at is, High Blood Pressure (Hypertension (HTN)). Having sudden nose bleed onsets, could be a sign of increased blood pressure.
Here is a list of some contributing risk factors for HTN, which you may want to take a look at, and see if any apply to you and your nose bleeds. Because the nose bleed may just be that early warning sign for HTN.
Quote:
Other risk factors for high blood pressure are within your control.
Excess weight. The greater your body mass, the more blood you need to supply oxygen and nutrients to your tissues. As the volume of blood circulated through your blood vessels increases, so does the pressure on your artery walls.
Inactivity. People who are inactive tend to have higher heart rates. The higher your heart rate, the harder your heart must work with each contraction — and the stronger the force on your arteries. Lack of physical activity also increases the risk of being overweight.
Tobacco use. The chemicals in tobacco can damage the lining of your artery walls, which promotes narrowing of the arteries.
Sodium intake. Too much sodium in your diet — especially if you have sodium sensitivity — can lead to fluid retention and increased blood pressure.
Low potassium intake. Potassium helps balance the amount of sodium in your cells. If you don't consume or retain enough potassium, you may accumulate too much sodium in your blood.
Excessive alcohol. Over time, heavy drinking can damage your heart.
Stress. High levels of stress can lead to a temporary but dramatic increase in blood pressure. If you try to relax by eating more, using tobacco or drinking alcohol, you may only fuel problems with high blood pressure.
Certain chronic conditions also may increase your risk of high blood pressure, including high cholesterol, diabetes, kidney disease and sleep apnea. Sometimes pregnancy contributes to high blood pressure.
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And always remember....
You can pick your friends.
You can pick your nose.
But, you can't pick your friends nose.