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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

    Babesiosis is a red blood cell infection caused by a parasite carried by deer ticks. Most infections happen in the…

  • 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 is a condition that affects your esophagus. It happens when acid from your stomach goes back up into your esophagus.

    Barrett’s Esophagus

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

  • A woman sits in a patient room dressed in a blue patient gown with hands folded in her lap. Bartholin’s gland cyst is a swelling that can occur near the opening of a woman’s vagina. Treatment is usually simple.

    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

    A breast cyst is a fluid-filled sac inside the breast. Breast cysts are common in women. They might cause a…

  • 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

    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

    Bloating is when your stomach is filled with air or gas from what you eat, your lifestyle, or for medical…

  • Blood Clots

    Blood clots are clumps of blood that form inside your body and can be harmful or even deadly if they…

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

    Blood Poisoning

    Blood poisoning happens when an infection enters your bloodstream and your body reacts to the infection.

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

    Bone Cancer

    Bone cancer is cancer that in most cases spreads to the bones from another part of the body. There are…

  • A woman dressed in pink wears a pink ribbon on her chest to promote breast cancer awareness. Breast cancer is the second most common cancer among women, but its death rate has declined over the last few years thanks to early detection.

    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.

  • A mother holds baby being checked for bronchiolitis by a doctor with a stethoscope.

    Bronchiolitis

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

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