Dizziness and nosebleed may be caused by hypertension, leukemia, endocrine disorders and so on. 1. Hypertension: Dizziness may occur due to intracranial vasodilatation because of excessive fluctuation of blood pressure. The elasticity of nasal blood vessels does not tolerate the change of blood pressure, and local rupture may occur, which may lead to the symptom of dizziness and nosebleed. 2. Leukemia: excessive loss of blood components may cause dizziness due to insufficient supply of oxygen and blood to the brain. Thrombocytopenia may lead to bleeding tendency of the nasal mucosa, and dizziness and symptoms of nosebleed may also occur. 3. Endocrine disorders: mainly seen in women, nosebleeds can occur during the menstrual period of pubertal development, and nosebleeds can also occur in menopausal or pregnant women, which may be related to the increase of capillary fragility. When too much blood loss can be secondary to anemia leading to dizziness. If you have dizziness and nosebleeds, it is recommended that you go to the relevant departments of regular hospitals as soon as possible to find the cause and standardize the diagnosis and treatment.