Dizziness and nausea after blood draw

Under normal circumstances, this depends on how much blood you draw. You may feel dizzy and nauseous after having your blood drawn. If the amount of bleeding is heavy, if you feel dizzy, it may be related to the amount of blood caused by this bleeding. If you take a little blood, consider this feeling and aura. The above are suggestions regarding the problem of "feeling very nauseous after having blood drawn". I hope this helps, I wish you good health! If not, it is recommended to go to the hospital for examination.

① Causes and common diseases

Common causes of dizziness include:

1. Nervous system diseases

Such as cerebral ischemic lesions, cerebellar lesions, brain lesions, brain trauma, certain types of epilepsy, etc. In addition, patients with autonomic dysfunction and certain neuroses also often feel dizzy.

2. Ear diseases

For example, ear diseases may affect balance and cause dizziness.

3. Internal medicine diseases

Such as hypertension, hypotension, various cardiovascular and cerebrovascular diseases, anemia, infection, poisoning, hypoglycemia, etc.

4. Cold

Sometimes a cold may cause dizziness.

5. Cervical vertebrae degeneration

The main cause of dizziness is the growth, deformation, and degeneration of the cervical vertebrae caused by long-term poor posture or sleeping position, tightening of the neck muscles, and obstruction of arterial blood supply, resulting in insufficient blood supply to the brain. The patient often experiences tightness in the neck, limited flexibility, occasional pain, numbness and coldness of the scalp and fingers, shoulder pain, a feeling of heaviness, and even nausea and palpitations.

6. Anemia

If dizziness is accompanied by fatigue and pale complexion, the possibility of anemia should be considered. Patients with indigestion, peptic ulcer, gastrointestinal bleeding and chronic inflammatory diseases may all develop anemia.

7. High blood viscosity

Hyperlipidemia, thrombocythemia and other conditions can increase blood viscosity and slow blood flow, resulting in insufficient blood supply to the brain, and easily leading to symptoms such as fatigue, dizziness, and weakness. Currently, the incidence of this type of disease is on the rise.

8. Cerebral arteriosclerosis

The patient feels dizzy and often suffers from insomnia, tinnitus, emotional instability, forgetfulness, and numbness in the limbs. Cerebral arteriosclerosis reduces the inner diameter of cerebral blood vessels, reduces blood flow in the brain, causes insufficient blood and oxygen supply to the brain, and causes dizziness. The clinical characteristics are three major symptoms: dizziness, sleep disorders, and memory loss, as well as occipital headache, mild paresis, speech disorders, and irritability. The disease generally develops slowly. The characteristic of this type of dizziness is that it is easy to occur or worsen when the body position changes.