What could be caulsing my random nose bleeds?

Many causes: Nose bleeding can be caused by simple things like dry air, trauma, medications. But also more worrisome things like bleeding disorders, uncontrolled hypertension or non-healing nasal lesions/ulcers and possibly cancer. I recommend you visit your physician to determine the etiology/cause.

Nose bleeds: 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.