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.