There are many diseases and conditions that can cause itch. Some of the most common include:
- Skin conditions such as eczema, psoriasis, and scabies
- Allergic reactions, such as hives or contact dermatitis
- Parasitic infections, such as lice or scabies
- Fungal infections, such as ringworm or athlete's foot
- Bacterial infections, such as impetigo or folliculitis
- Liver diseases, such as cirrhosis or hepatitis
- Kidney disease
- Iron-deficiency anemia
- Thyroid disorders
- Cancer, such as leukemia or lymphoma
- Neurological disorders, such as multiple sclerosis or spinal cord injury