Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.


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All conditions that start with the letter B
  • a tick sits on a leaf


    Babesiosis is an infection of the red blood cells. It is caused by a single-cell parasite called Babesia.

  • Bacterial Endocarditis

    Bacterial endocarditis is an infection in the valves and inner lining of your heart.

  • Woman with bacterial vaginosis dressed in blue silk nightgown with hands covering her crotch and lower abdomen

    Bacterial Vaginosis (BV)

    Bacterial vaginosis is a mild infection in the vagina caused by an overgrowth of bacteria. Researchers do not completely understand…

  • Barrett’s Esophagus

    Barrett’s esophagus is a condition that affects your esophagus. It happens when acid from your stomach goes back up into…

  • Woman sitting in a patient room dressed in a blue patient gown with hands folded in her lap

    Bartholin's Gland Cyst

    Bartholin’s gland cyst is a swelling that can occur near the opening of a woman’s vagina. They can become infected,…

  • Bedbugs

    Bedbugs are oval-shaped, wingless parasites. They have 6 legs and are about 1/5 of an inch long. They are white…

  • Illustration of a woman with and without Bell’s palsy

    Bell’s Palsy

    Bell’s palsy is a condition that temporarily paralyzes the side of your face. It usually goes away on its own…

  • Woman performing breast exam

    Benign Breast Conditions

    While breast abnormalities are often associated with cancer, there are many other benign conditions women (and men) need to be…

  • blurred, spinning picture of a person’s feet as they walk through fall leaves

    Benign Paroxysmal Positional Vertigo (BPPV)

    Benign paroxysmal positional vertigo can be caused by problems with the inner ear related to ear infections, family history, or…

  • Benign Prostatic Hyperplasia (BPH)

    Benign prostatic hyperplasia (BPH) is the medical term for an enlarged prostate. This condition is associated with aging and mimics…

  • Two-faced woman, one happy and one sad, holding neutral mask in between

    Bipolar Disorder

    Bipolar disorder is a mental illness that causes extreme mood swings between happy and sad. People of all ages and…

  • X-ray of woman’s pelvis, showing bladder stones

    Bladder Stones

    Bladder stones are small crystals that form in your urine. They are hard and become trapped in your bladder. They…

  • Woman holding eye in pain


    Blepharospasm is a rare condition that causes your eyelid to blink or twitch. You can’t control it. It’s caused by…

  • Hands grabbing a bloated stomach


    Bloating occurs in your abdomen. It happens when your GI tract fills with air or gas. Your stomach feels tight…

  • Blood Clots

    Blood clots are differently sized clumps of blood that have formed inside your body. They can be harmful if they…

  • red and white blood cells traveling through a vein in the human body

    Blood Poisoning

    Blood poisoning has nothing to do with poison. It’s caused when bacteria enter your bloodstream. That can happen through burns,…

  • X-ray of image with red highlighting area of cancer

    Bone Cancer

    Bone cancer is cancer of the bones. Most cases of bone cancer start in other areas and spread to the…

  • woman dressed in pink wears a pink ribbon on her chest

    Breast Cancer

    Breast cancer is the second most common cancer among women, but its death rate has declined over the last few…

  • Close-up cropped portrait of young woman with breast pain touching chest

    Breast Pain in Women

    Breast pain in women can be caused by many factors, most of which are not serious health threats.

  • mother holds baby being checked by a doctor with a stethoscope


    Bronchiolitis is a common lung infection in infants and young children. It is usually caused by a virus. RSV is…