Early stage ductal carcinomas may not be noticeable during breast self-examinations, clinical breast examinations performed by a physician or other healthcare provider, or even in mammograms. Many cases of ductal carcinoma are diagnosed before they present any symptoms. Routine screening mammograms indicate microcalcifications or other signs that require further investigation. However, as malignant cells grow, over a period of months and sometimes several years, noticeable signs or symptoms may develop.

The cancer may start with cells that have not yet formed a lump. As the cancer progresses, the tumor grows and a lump may be felt (palpated) by the individual or a physician. In addition, the lymph nodes may become enlarged, indicating a possible spread (metastasis) of the cancer.

When symptoms do occur, they may include:

• A lump or thickening in the breast
  
  
• Rash on the skin of the breast, areola or nipple that appears scaly, red or swollen
  
  
• Ridges, pitting or dimpling of the breast
  
  
• Fluid from nipples (discharge)
  
  
• A lump in the underarm area
  
  
• Nipple tenderness
  
  
• A change in the size or shape of the breast
  
  
• A nipple turned inward (into the breast)

In the majority of breast cancer diagnoses, there is no pain associated with the development of breast cancer. However, some individuals have reported pain around the lump in the breast.