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 C
  • C. diff., or clostridium difficile, bacterium isolated on black background. A clostridium difficile (C. diff.) infection is a bacterial infection in your intestines. C. diff. infections can range from mild to severe.

    C. diff (Clostridium difficile) Infection

    A clostridium difficile (C. diff.) infection is a bacterial infection in your intestines.

  • A doctor holds a cancer patient’s hand. Cancer is a collection of many diseases that all involve the growth of abnormal cells. Some common forms are skin, breast and prostate cancer.

    Cancer

    Cancer is a collection of many diseases that all involve the growth of abnormal cells. Some common forms are skin…

  • Close-up of child with canker sore on inside of lip

    Canker Sores

    Canker sores are small, thin sores in your mouth. You might get them on the inside of your lips or…

  • A woman having chest pains places her hands over her heart. Cardiomyopathy is a disease that causes your heart muscles to become enlarged, which can weaken your heart over time.

    Cardiomyopathy

    Cardiomyopathy is a disease of the muscles in the heart. It causes your heart muscles to become enlarged.

  • A man working at a computer, grabbing his right wrist in pain. Carpal tunnel syndrome occurs when the tissues in your wrist get swollen or inflamed and press on the median nerve, making your hand hurt.

    Carpal Tunnel Syndrome

    Carpal tunnel syndrome is a painful disorder that occurs when the tissues in your wrist get swollen or inflamed and…

  • fluffy domestic cat stretches its paw and claws in the air

    Cat-Scratch Disease (Cat-Scratch Fever)

    Cat-scratch disease is an infection you can get after a cat scratches, bites, or licks you. It is caused by…

  • Celiac disease is a digestive disorder that causes problems when you eat foods with gluten, such as wheat, rye and barley.

    Celiac Disease

    Celiac disease is a digestive disorder that causes problems when you eat foods with gluten, such as wheat, rye and…

  • A doctor bandaging a patients hand to prevent a skin infection. Cellulitis is a skin infection caused by bacteria. It can spread to your lymph nodes and cause a blood infection if not treated.

    Cellulitis

    Cellulitis is a skin infection caused by bacteria. It can spread to your lymph nodes and cause a blood infection…

  • group of early teens sitting together playing on phones

    Central Precocious Puberty

    Central precocious puberty is the early onset of puberty. It can occur in children younger than 8 or 9 years…

  • laughing young boy with cerebral palsy sits in his wheelchair next to his sister

    Cerebral Palsy

    Cerebral palsy is a group of brain disorders that affect body movement and muscle coordination. It can be mild or…

  • A woman clutching her cervix in pain

    Cervical Cancer

    Cervical cancer is abnormal growth of cells in a woman’s cervix. Cervical cancer is almost always caused by the human…

  • Cervical Dysplasia

    Cervical dysplasia is when there are abnormal, or precancerous, cells in and around a woman’s cervix. This doesn’t mean you…

  • Young woman massaging neck, which is in pain

    Cervical Dystonia

    Cervical dystonia is a neurological disorder that causes your neck muscles to contract involuntarily. This can make your head lean…

  • Man suffering from neck pain and stiffness holds neck

    Cervical Spondylotic Myelopathy (CSM)

    Cervical spondylotic myelopathy (CSM) is a compression of the spinal cord in your neck.

  • Toddler with chickenpox lying on stomach

    Chickenpox

    Chickenpox is a highly contagious disease caused by a virus. It once was a common childhood disease until a vaccine…

  • Chlamydia

    Chlamydia

    Chlamydia (Chlamydia trachomatis) is a sexually transmitted infection (STI) that often has no symptoms.

  • Lung Symptoms

    Chronic Bronchitis

    Chronic bronchitis is an inflammation in the airways of the lungs that lasts longer than 3 months. It is most…

  • Chronic Cough

    A chronic cough is one that lasts for 8 weeks or more.

  • A woman sitting in front of her computer, talking on her cell phone, and yawning

    Chronic Fatigue Syndrome

    Chronic fatigue syndrome is a disease that causes extreme fatigue that lasts for more than 6 months and interrupts daily…

  • Young male patient sleeping in hospital bed while receiving dialysis treatment

    Chronic Kidney Disease (CKD)

    Chronic Kidney Disease involves progressive damage to your kidneys caused by high blood pressure, diabetes and heart disease.