Here is a list of some known diseases and conditions that can cause itchiness (pruritus):
- Eczema (Atopic dermatitis)
- Contact dermatitis
- Psoriasis
- Urticaria (Hives)
- Scabies
- Chickenpox
- Shingles (Herpes zoster)
- Insect bites and stings
- Allergic reactions
- Dermatitis herpetiformis (associated with celiac disease)
- Prurigo nodularis
- Dermatographism (skin writing)
- Lichen planus
- Dermatomyositis
- Cutaneous T-cell lymphoma
- Iron deficiency anemia (can cause generalized itching)
- Liver disease (such as hepatitis or cirrhosis)
- Kidney disease (chronic kidney disease or kidney failure)
- Diabetes (uncontrolled or poorly managed diabetes)
- Thyroid disorders (hypothyroidism or hyperthyroidism)
Please note that this list is not exhaustive, and itchiness can be a symptom of various other underlying conditions. It is always recommended to consult with a healthcare professional if you are experiencing persistent or bothersome itching to determine the cause and receive appropriate treatment. Most of these conditions are not deadly.