Read below about asymmetrical breasts, including causes and common questions. Or get a personalized analysis of your asymmetrical breasts from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

This symptom can also be referred to as:
One breast is larger than the other

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10 Potential Asymmetrical Breasts Causes

Disclaimer: The article does not replace an evaluation by a physician. Information on this page is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes.

  1. 1.Scoliosis

    Scoliosis causes a sideways curve of your backbone, or spine. Scoliosis is most common in late childhood and the early teens, when children grow fast.

    Chronic, but curable

    Rarity:
    Common
    Top Symptoms:
    spontaneous back pain, shortness of breath on exertion, asymmetrical shoulders, asymmetrical breasts, back deformity
    Urgency:
    Wait and watch
  2. 2.Non - Specific Breast Pain

    Breast pain is either related to menstruation (cyclic) or not (noncyclic). It is common in pre-menopausal women and can also be a side effect of contraceptives that contain hormones like the pill, anticonceptive injections and intra-uterine devices.

    7 days

    Rarity:
    Common
    Top Symptoms:
    breast pain, breast swelling, armpit pain
    Symptoms that always occur with non-specific breast pain:
    breast pain
    Urgency:
    Primary care doctor
  3. 3.Viral (Norovirus) Infection

    Noroviruses are a group of related viruses that leads to nausea, vomiting, diarrhea, and cramps. These viruses cause gastroenteritis, an inflammation of the stomach and intestines. When the diarrhea and/or vomiting is severe, dehydration can occur. Symptoms of dehydration include a dry mouth, dizziness, urinating less frequently and dark urine.

    Usually resolves within 2-3 days.

    Rarity:
    Common
    Top Symptoms:
    diarrhea, vomiting or nausea, fatigue, nausea, abdominal pain (stomach ache), headache
    Symptoms that always occur with viral (norovirus) infection:
    diarrhea, vomiting or nausea
    Symptoms that never occur with viral (norovirus) infection:
    severe abdominal pain, throbbing headache, severe headache, tarry stool, vaginal bleeding, alertness level change
    Urgency:
    Self-treatment
  4. 4.Premature Ovarian Failure

    "Premature ovarian failure" (POF), also called "primary ovarian insufficiency" and "early menopause" happens when the ovaries stop working well too early in life. Naturally menopause occurs between the ages 45 and 55. Symptoms of menopause are changes in menstrual period, missing periods, hot flashes, mood changes and vaginal dryness.

    Indefinite

    Rarity:
    Common
    Top Symptoms:
    fatigue, anxiety, irritability, vaginal itch or burning, muscle aches
    Urgency:
    Primary care doctor
  5. 5.Intraductal Papilloma

    Breast problems such as lumps are very common and often not caused by breast cancer. An intraductal papilloma is such a benign breast lump situated in the milk ducts.

    Most often, removal of the lump is needed to prevent it from becoming cancerous on the long term.

    Rarity:
    Uncommon
    Top Symptoms:
    breast lump, painful breast lump, painless breast lump, white or clear fluid leaking from the breast, nipple lump
    Symptoms that never occur with intraductal papilloma:
    armpit lump
    Urgency:
    Primary care doctor

    Asymmetrical Breasts Checker

    Take a quiz to find out why you’re having asymmetrical breasts.

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  6. 6.Breast Abscess

    A breast infection is an infection in the tissue of the breast. Breast infections are usually caused by a common bacteria, Staphylococcus aureus, found on normal skin.

    2-3 weeks with treatment

    Rarity:
    Rare
    Top Symptoms:
    nausea, breast pain, signs of breast inflammation like redness, swelling or fever, fever, chills
    Symptoms that always occur with breast abscess:
    breast pain, signs of breast inflammation like redness, swelling or fever
    Urgency:
    Primary care doctor
  7. 7.High Prolactin Hormone Level

    Hyperprolactinemia is a common hormonal disorder in which there are higher than normal levels of prolactin in the blood.

    Depending on the severity of illness, therapy ranges from watchful waiting to medication or surgery.

    Rarity:
    Rare
    Top Symptoms:
    headache, vaginal bleeding, irregular period, decreased sex drive, enlargement of breasts
    Urgency:
    Primary care doctor
  8. 8.Breast Cyst

    A breast cyst is a fluid-filled sac (like a tiny balloon) inside the breast. Breast cysts are common in women. They might cause a little pain, but they are usually benign (not cancerous).

    Resolves with treatment but can recur

    Rarity:
    Common
    Top Symptoms:
    breast pain, breast lump, painful breast lump, movable breast lump
    Symptoms that always occur with breast cyst:
    breast lump
    Symptoms that never occur with breast cyst:
    armpit lump, fever
    Urgency:
    Primary care doctor
  9. 9.Premenstrual Syndrome

    Premenstrual syndrome (PMS) is a very common condition. PMS has a variety of symptoms including cramping, mood swings, food cravings, fatigue, irritability, breast tenderness & depression.

    Symptoms of premenstrual syndrome can last all the way into menopause.

    Rarity:
    Common
    Top Symptoms:
    stomach bloating, anxiety, constipation, depressed mood, breast pain
    Symptoms that never occur with premenstrual syndrome:
    constant sadness, severe sadness, post-menopausal
    Urgency:
    Self-treatment
  10. 10.Fibroadenoma

    Fibroadenomas are solid, noncancerous breast tumors that occur most often in adolescent girls and women under the age of 30. You might describe a fibroadenoma as firm, smooth, rubbery or hard with a well-defined shape.

    Chronic if left un-treated

    Rarity:
    Common
    Top Symptoms:
    breast pain, breast lump, round breast lump, movable breast lump, painless breast lump
    Symptoms that always occur with fibroadenoma:
    breast lump
    Urgency:
    Primary care doctor

Questions Your Doctor May Ask About Asymmetrical Breasts

  • Q.Any fever today or during the last week?
  • Q.Have you been feeling more tired than usual, lethargic or fatigued despite sleeping a normal amount?
  • Q.When was your last menstrual period?
  • Q.Have you had any changes in your weight?

If you've answered yes to one or more of these questions, try our asymmetrical breasts symptom checker to find out more.

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Asymmetrical Breasts Symptom Checker Statistics

  • People who have experienced asymmetrical breasts have also experienced:

    • 11% Breast Pain
    • 3% Breast Lump
    • 2% Vaginal Bleeding
  • People who have experienced asymmetrical breasts were most often matched with:

    • 35% Scoliosis
    • 10% Non - Specific Breast Pain
    • 6% Viral (Norovirus) Infection
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

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