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Hello Anon

Thank you for writing.

There are many causes and risks for nosebleeds - some may pertain to you, many won't.

Causes include:

Irritation or breakage to the lining of the nose
Injury to the nasal tissue, which occurs more easily when nasal structure is not normal or the passages are inflamed due to a cold or allergies
Exceptionally dry nasal tissue
Picking or bumping the nose
Forceful blowing or rubbing the nose
A clot from a previous nosebleed becoming disturbed or dislodged
A foreign object placed in the nose
Tumors of the nose and/or sinuses
Hypertension (high blood pressure)
Use of aspirin or other blood thinning (anticoagulant) medications
Other causes of tendency toward excessive bleeding, including hemophilia

Risk Factors
A risk factor is something that increases your chance of getting a disease or condition. Risk factors for nosebleed include:

Irregularity in the structure of the nose
Abnormalities of the blood vessels in the nose (angiomas)
Dry climate
Winter, with dry, heated indoor air
Allergies
Colds
Sinusitis
Infections including:
Chickenpox
Malaria
Influenza
Scarlet fever
Typhoid fever
Diseases including:
Sarcoidosis
Wegener's granulomatosis
Childhood and advanced age
Cocaine use
Lupus
Bleeding or clotting disorders including those due to:
Leukemia
Liver disease
Aplastic anemia
Low platelet counts
Hemophilia
Cancer treatment
Anticoagulant (blood-thinning) drugs, including aspirin
High blood pressure

Anon, the congestion you have been experiencing is likely the cause. If you can use a humidifier in your home/work, consider doing so. Since this has been going on for sometime now, talk to your doctor.
Best,
Susan