Itchy sides below the ribs can be related to allergic dermatitis, herpes zoster, dry skin and other causes. 1. Allergic dermatitis: when the skin under the rib cage comes into contact with various exogenous allergens, it can cause an abnormal immune response of the body, produce antibodies, desensitize the body, and then when it comes into contact with the allergens again, it can lead to inflammatory reaction and itchiness under the rib cage and other uncomfortable symptoms. 2. Herpes zoster: after infection with the herpes zoster virus, the disease can start when the body’s resistance decreases, herpes zoster can develop along the nerves below the ribs, blisters and herpes papules can appear locally, and pain, itching and other uncomfortable symptoms can occur. 3. Dry skin: in the fall or winter, the climate is dry, which can lead to dryness and flaking in the area below the rib cage, and symptoms such as itchy skin in different degrees. When the two sides of the lower ribs itch, you should consult a doctor in a timely manner, under the guidance of a specialist to actively carry out appropriate treatment, which will help to alleviate the discomfort symptoms as soon as possible.