Itching

Other diseases

• Diabetes mellitus, a group of metabolic diseases in which a person has high blood sugar
• Hyperparathyroidism, overactivity of the parathyroid glands resulting in excess production of parathyroid hormone (PTH)
• Iron deficiency anemia, a common anemia (low red blood cell or hemoglobin levels)
• Cholestasis, where bile acids leaking into the serum activate peripheral opioid receptors, resulting in the characteristic generalized, severe itching
• Malignancy or internal cancer, such as lymphoma or Hodgkin's disease
• Polycythemia, which can cause generalized itching due to increased histamines. In polycythemia vera itching is particularly caused by skin contact with warm water, such as in bath or shower.
• Psychiatric disease ("psychogenic itch", as may be seen in delusional parasitosis)
• Thyroid illness
• Uraemia – the itching sensation this causes is known as uremic pruritus
• mast cell activation syndrome (MCAS).
• fibromyalgia