Mastitis or Breast Abscess: This condition is often associated with sharp, intermittent pain, especially if it's related to lactation or an infection. The pain can be severe and is usually accompanied by other symptoms like redness, swelling, and fever.

Costochondritis: Also known as Tietze's syndrome, this condition involves inflammation of the cartilage that connects the ribs to the breastbone, which can cause sharp pains in the chest area, including the breast.
Fibrocystic Breast Changes: These are benign changes in the breast tissue that can cause lumps, tenderness, and sharp pains, especially during the menstrual cycle.
Breast Cyst: A fluid-filled sac within the breast that can cause intermittent sharp pain, especially if it becomes large or ruptures.

Breast Cancer: Although less likely to present with sharp intermittent pain, breast cancer can cause a variety of symptoms, including pain. It's crucial not to miss this diagnosis due to its severe implications.
Pulmonary Embolism: If the pain is referred from the chest and is sharp and intermittent, it could be a sign of a pulmonary embolism, especially if accompanied by shortness of breath or other respiratory symptoms.
Cardiac Conditions (e.g., Myocardial Infarction): Sharp chest pain can sometimes be referred to the breast area. Conditions like myocardial infarction (heart attack) are critical and must not be missed.

Sickle Cell Disease Crisis: Individuals with sickle cell disease can experience acute chest syndrome, which may include sharp pain in the breast area among other symptoms.
Neuroma or Nerve Entrapment: Rarely, sharp intermittent pain in the breast can be due to a neuroma (a growth on a nerve) or nerve entrapment, which can cause localized pain.
Thoracic Outlet Syndrome: This condition involves compression of the nerves and/or blood vessels that pass into the thoracic outlet (the space between your collarbone and first rib), which can cause pain in the breast area among other symptoms.