What would cause almost my whole body to itch constantly? chest, stomach, arms, back and legs. no rash or dry skin. chest, arms, legs are extra itchy

Itch: Several reasons for causing it. Mechanism stays the same. Mast cells are specialized histamine containing cells in skin which get triggered by some stimulus- ie food product, detergent, cream, or even emotions like anxiety, chronic diseases esp liver and kidney diseases, certain cancers and graft vs host disease could also be trigger. Need work up and Cromolyn Sodium is mast cell stabilizer helps.