Itchy Skin (pruritus)
Diagnosis
Tracking down the cause of your itch can take time and involve a physical exam and questions about your medical history.
If your doctor thinks your itchy skin is the result of a medical condition, you might have tests, including: Blood test. A complete blood count can provide evidence of an internal condition causing your itch, such as anemia.
Tests of thyroid, liver and kidney function. Liver or kidney disorders and thyroid abnormalities, such as hyperthyroidism, may cause itching.
Chest X-rays. A chest X-ray can show if you have enlarged lymph nodes, which can go along with itchy skin.