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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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  • Chlamydia

    Chlamydia: Symptoms and Treatment

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

  • STI Symptoms and Prevention

    Learn about sexually transmitted infections and how you can prevent them.

  • A 3-D illustration of hepatitis B virus in blood vessel with red blood cells

    Hepatitis B

    Hepatitis B is a serious liver infection caused by a virus. It is usually spread from person to person through…

  • A young girl receives the measles vaccine from a doctor. Measles is a very contagious respiratory illness that also causes a fever and a rash. It is preventable with a vaccine.

    Measles: Symptoms and Treatment

    Measles (also called rubeola) is a serious respiratory illness. This means it affects the lungs and breathing tubes. It also…

  • Preschool boy plays on a tire swing, leaning back as far as he can. Sensory processing disorder (SPD) is a condition that affects how your brain processes sensory information (stimuli).

    Sensory Processing Disorder (SPD)

    Sensory processing disorder (SPD) is a condition that affects how your brain processes sensory information (stimuli).

  • A sad woman holds a teddy bear in an empty nursery. An early pregnancy loss is a miscarriage that occurs on its own during the first 20 weeks of the pregnancy.

    Early Pregnancy Loss

    An early pregnancy loss is a miscarriage that occurs on its own in the first 20 weeks of the…

  • A man suffering from an ulcer clutches his abdomen in pain. An ulcer is a sore on the lining of your stomach or small intestine. Ulcer symptoms include stomach pain, bloating and feeling full fast.

    Ulcers - Stomach Ulcer Symptoms

    Ulcers are sores on the lining of your stomach or small intestine.

  • A woman grimaces while putting her fingers in her ears. Tinnitus causes you to hear an “internal” noise in one ear or both ears. You may hear the noise constantly, or it may come and go.

    Tinnitus: Causes and Treatment

    Tinnitus is a problem that causes you to hear an “internal” noise in one ear or both ears. You may…

  • A child’s hand with red and swollen skin around fingernail caused by a skin infection. Paronychia is a skin infection around the nails. It usually affects the skin at the base (cuticle) or up the sides of the nail.

    Paronychia

    Paronychia is a skin infection around the fingernails or toenails. It usually isn’t serious and can be treated at…

  • Overweight female with fat folds under her bra clasp in the back

    Intertrigo

    Intertrigo is a rubbing of the skin in areas where the skin folds and becomes moist.

  • Baby sleeping in a position on his father’s arm to help treat colic

    Colic

    Colic is when your baby cries for longer than 3 hours a day at least 3 days per week. It…

  • COVID-19 is a disease caused by a coronavirus called SARS-CoV-2, which was identified in 2019.

    Coronavirus (COVID-19)

    Learn how to better protect yourself from COVID-19.

  • A woman with hives on the backs of her legs

    Mastocytosis

    Mastocytosis is the abnormal growth of cells from the immune system in your body. It can occur in people of…

  • Lyme Disease: Symptoms, Diagnosis, and Treatment

    Lyme disease is a bacterial infection caused by a tick bite.

  • Poison ivy is a type of toxic plant that can cause an itchy rash. Poison ivy often grows low to the ground, resembling a weed or shrub.

    Poison Ivy Rash (Treatment and Prevention)

    Poison ivy is a type of toxic plant. It is common in most parts of the United States. Poison ivy…

  • a mother breastfeeds her baby

    Mastitis

    Mastitis is an inflammation of the breast usually caused by an infection.

  • A woman with diabetes pricks her finger to test her insulin level. Diabetes is a disease that occurs when your body doesn’t make or use the hormone insulin properly. It causes too much blood glucose (sugar) in the blood.

    Type 1 Diabetes

    Diabetes is a disease that occurs when your body doesn’t make or use the hormone insulin properly.

  • Female therapist working with young boy on floor

    Asperger's Syndrome

    Asperger’s syndrome is a developmental disorder affecting speech and behavior.

  • View of a man’s spinal column through the back of his shirt

    Spinal Cord Injury

    Common causes of spinal cord injury include falling, sports-related events, car accidents, and diseases such as polio or spina…

  • Hand Massage to help pain in the finger joints.

    Scleroderma

    Scleroderma is a rare autoimmune disorder. There are 2 types of scleroderma. One type affects the skin. The other type…

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