What Causes Breast Tenderness and Pain in Women?

Women commonly experience breast tenderness or pain—medically termed mastalgia—which can range from mild discomfort to severe, debilitating discomfort. This symptom is broadly categorized into cyclical and noncyclical forms, each with distinct underlying causes.

Cyclical mastalgia is the most prevalent type and is closely linked to hormonal fluctuations during the menstrual cycle. Estrogen and progesterone levels rise in the luteal phase—typically the week before menstruation—causing breast ductal and lobular tissue proliferation, fluid retention, and increased sensitivity. Symptoms usually resolve spontaneously with the onset of menses and recur predictably each cycle.

Noncyclical mastalgia lacks a clear relationship to menstruation and may originate from musculoskeletal sources—including costochondritis, cervical or thoracic spine dysfunction, or pectoralis muscle strain—as well as from benign breast conditions such as fibrocystic changes, duct ectasia, or mammary duct fistula. Less commonly, it may signal inflammatory processes like mastitis (particularly in lactating individuals) or, rarely, malignancy—though isolated breast pain is seldom the presenting feature of breast cancer.

Other contributing factors include pharmacologic agents—such as hormonal contraceptives, hormone replacement therapy, selective serotonin reuptake inhibitors (SSRIs), and certain cardiovascular medications—as well as lifestyle elements like high caffeine intake, ill-fitting bras, or significant stress. In postmenopausal women, new-onset breast pain warrants careful clinical evaluation to exclude structural abnormalities or iatrogenic causes.

A thorough assessment—including detailed history, physical examination, and, when indicated, imaging (e.g., diagnostic mammography or targeted ultrasound) or biopsy—is essential to differentiate benign etiologies from those requiring intervention. Management is tailored to the underlying cause and may involve reassurance, supportive measures (e.g., proper bra fit, NSAIDs), hormonal modulation, or referral to specialty care.