Hello, I read carefully your query and understand your concern. The most common causes of nosebleeds are dryness and nose picking. These 2 things work together,nose picking occurs more often when mucus in the nose is dry and crusty. Other, less common, causes include colds or allergies. Leukaemia is a very rare cause and has many other symptoms,so I suggest you not to consider this cause. I recommend drinking liquids and using a saline nasal spray. I also suggest using a humidifier at home. Hope my answer was helpful. If you have further queries feel free to contact me again. Kind regards! Dr.Dorina Gurabardhi General &Family Physician