The goal of this clinical trial is to evaluate whether auricular acupressure combined with basic care can improve symptoms in postpartum women with blocked milk ducts after cesarean delivery. The main questions it aims to answer are:

• Does auricular acupressure combined with basic care reduce breast pain more effectively than basic care alone?
• Does the combined approach improve the severity of milk duct blockage compared with basic care alone?
• What adverse effects may occur in participants receiving auricular acupressure? Researchers will compare auricular acupressure combined with basic care to sham auricular acupressure plus basic care to determine whether the intervention provides additional benefits.

Participants will:

• Receive auricular acupressure (or sham auricular acupressure at non-therapeutic ear points) for 3 days.
• Be instructed to perform basic breast care under the supervision of midwives three times daily for 3 days.
• Record daily activities in monitoring forms, including breastfeeding times, and whether they performed warm compresses and breast massage.

This randomized, single-blind, controlled clinical trial aims to evaluate the effectiveness and safety of auricular acupressure combined with basic breast care in postpartum women with blocked milk ducts following cesarean delivery.

Participants who meet the eligibility criteria will be randomly assigned to either the intervention group (auricular acupressure plus basic breast care) or the control group (sham auricular acupressure plus basic breast care). Auricular acupressure will be applied using semi-permanent auricular pellets at therapeutic ear acupoints on the ear ipsilateral to the affected breast, while the control group will receive sham intervention at non-therapeutic points. Both groups will receive standardized basic breast care, including frequent breastfeeding or milk expression, breast massage during feeding, and warm compresses before feeding.

The intervention will be administered over 3 consecutive days. Participants will be instructed and supervised by trained midwives and will perform self-care during the study period. Outcomes will be assessed at baseline and daily during the intervention period.

The primary outcome is the change in breast pain score measured by the Numeric Rating Scale (NRS). Secondary outcomes include changes in the severity of blocked milk ducts, use of rescue analgesic medication, and incidence of adverse events.

This study is designed as a randomized controlled trial to evaluate the effectiveness of auricular acupressure combined with basic breast care in postpartum women with blocked milk ducts following cesarean delivery. The sample size was calculated based on the primary outcome of pain intensity measured using the Numeric Rating Scale (NRS). A between-group difference of 1.8 NRS points was considered clinically meaningful. Using a two-sided significance level of 0.05, a power of 80%, and an estimated standard deviation of 2.56, the minimum required sample size was 32 participants per group. After allowing for an anticipated attrition rate of 10%, a total of 72 participants were recruited and randomized equally to the intervention group (n = 36) and the control group (n = 36).

Inclusion Criteria:

Participants must meet all of the following criteria:

• Postpartum women aged 18-40 years who have undergone cesarean delivery and are hospitalized in the obstetrics department.
• At least 24 hours after cesarean delivery.
• Diagnosed with uncomplicated blocked milk ducts based on clinical signs, including localized breast pain and engorgement, a palpable localized firm mass, and reduced or interrupted milk flow.
• Absence of systemic signs of infection (e.g., fever ≥38.5°C, chills, or severe fatigue) and no evidence of breast abscess.
• Numeric Rating Scale (NRS) pain score ≥ 4.
• Gestational age ≥ 37 weeks, with a healthy newborn without abnormalities.
• Willing and able to provide written informed consent.

Exclusion Criteria:

Participants meeting any of the following criteria will be excluded:

• Clinical signs of mastitis, breast abscess, or breast infection.
• Underlying medical conditions that may affect lactation, such as diabetes mellitus, thyroid disorders, or chronic liver or kidney disease.
• Known allergy or hypersensitivity to materials used in auricular acupressure or components of basic breast care.
• Severe psychiatric or cognitive conditions that may impair the ability to follow study procedures.
• Inability or unwillingness to comply with the study protocol.

This study is designed as a single-blind randomized controlled trial. Participants will be randomly assigned to either the intervention group or the control group and will be blinded to group allocation. They will not be informed about the specific therapeutic effects of the auricular acupoints used. Both groups will receive similar procedures, including the use of identical auricular pellets, application techniques, and instructions for self-pressing, to minimize the risk of unblinding.

Investigators administering the interventions and collecting outcome data will not be blinded due to the nature of the procedures. However, data analysis will be performed by an independent statistician using coded group allocation (e.g., A/B) to reduce potential bias.