what causes severe itching
Possible causes of itchy skin include: 1  Dry skin. 2  Skin conditions and rashes. 3  Internal diseases.  Nerve 1  disorders. Irritation and allergic reactions. 2  Drugs. Pregnancy.
Reactions to drugs, such as antibiotics, antifungal drugs or narcotic pain medications, can cause widespread rashes and itching. Pregnancy. During pregnancy, some women experience itchy skin, especially on the abdomen and thighs. Also, itchy skin conditions, such as dermatitis, can worsen during pregnancy.