At its earliest stages, invasive lobular carcinoma may cause no signs and symptoms. As it grows larger, invasive lobular carcinoma may cause: 
An area of thickening in part of the breast
A new area of fullness or swelling in the breast
A change in the texture or appearance of the skin over the breast, such as dimpling or thickening
A newly inverted nipple
 Invasive lobular carcinoma is less likely than other forms of breast cancer to cause a firm or distinct breast lump.