There are many reasons for unilateral nipple tingling, such as inflammatory lesions of the nipple orifice, mammary hyperplasia, cracked nipple and so on. 1. Inflammatory lesions: this situation is more common, the tingling is persistent, more obvious when touched, the inflammation is mild, in addition to tingling no other discomfort, the inflammation is more serious, there may be nipple enlargement or nipple oozing. 2. Mammary hyperplasia: Some people with symptoms of mammary hyperplasia may show symptoms of tingling in the nipple, and this tingling is mostly intermittent, with a mild degree of pain. 3. Cracked nipples: If you don’t pay attention to hygiene during breastfeeding, the nipples are broken or cracked, or the nipples are bitten open due to incorrect feeding style, change the feeding style and keep the nipples clean and dry. 4. Nipple trauma: For example, nipple trauma caused by nipple being hit or pressed can also lead to nipple tingling. Unilateral nipple tingling may also be caused by other reasons such as tumor. It is recommended that the patient should consult the doctor in time and choose the appropriate way of treatment under the doctor’s guidance.