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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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  • Milk and cheese on a table. Lactose intolerance is a condition that causes stomach discomfort. It’s your body reacting to the sugar in milk (or other dairy).

    Lactose Intolerance

    Lactose intolerance is a condition that causes stomach discomfort. It’s your body reacting to the sugar in milk (or other…

  • Labyrinthitis

    Labyrinthitis is a condition that affects a part of the inner ear called the labyrinth. When it is swollen, you…

  • A woman holding her lower back on one side, indicating kidney pain

    Kidney Stones

    Your body removes waste through urine that’s made in your kidneys. When waste doesn’t properly leave your kidneys, it can…

  • Close-up of a young businessman holding side with kidney pain

    Kidney Infection Symptoms and Treatment

    A kidney infection results when bacteria get into one or both of your kidneys.

  • An illustration of a healthy kidney and a kidney with cysts

    Kidney Cysts

    Kidney cysts are sacs filled with fluid that form in the kidneys. These small, oval or round sacs are almost…

  • a woman with keratosis pilaris scratches the back of her arm

    Keratosis Pilaris

    Keratosis pilaris is a harmless skin condition that causes small bumps to appear on the skin. They can appear anywhere…

  • woman with a keloid or raised scar on her shoulder

    Keloids (Raised Scars)

    Keloids are a type of raised scar. They occur where the skin has healed after an injury and can grow…

  • Juvenile Rheumatoid Arthritis

    Juvenile rheumatoid arthritis can cause joint pain and swelling in children younger than 16. Its symptoms can be intermittent or…

  • What does jock itch look like? Jock itch appears as a skin rash around the groin.

    Jock Itch

    Jock itch is a contagious fungal skin infection that usually appears around the groin in men.

  • Man's hands on his stomach with red spot indicating pain caused by irritable bowel syndrome (IBS)

    Irritable Bowel Syndrome (IBS)

    Irritable bowel syndrome (IBS) is a gastrointestinal (GI) disorder. It describes a group of symptoms that affect your large intestine…

  • A baby cries in distress. Intussusception is a serious problem with the intestine that prevents the passage of food through the intestine. It is a medical emergency.

    Intussusception

    Description: Intussusception is a serious problem with the intestine that prevents the passage of food through the intestine.

  • Closeup of a mother helping her toddler walk in the grass

    Intoeing

    Most people’s feet point straight ahead or outward. Some people, however, have feet that point inward. This is called…

  • 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.

  • illustration and cross-section of kidneys

    Interstitial Nephritis

    Interstitial nephritis is a kidney disorder that affects your kidneys’ ability to filter waste and extra fluid.

  • Woman with hands crossed over her pelvis as if she is in pain or needs to use the restroom. Interstitial cystitis is chronic inflammation of the bladder. This inflammation can scar the bladder or make it stiff.

    Interstitial Cystitis

    Interstitial cystitis is chronic inflammation of the bladder.

  • Insulin resistance means your body is unable to process all the insulin your body is making. It is linked to prediabetes and type 2 diabetes.

    Insulin Resistance

    Insulin resistance is a condition linked to prediabetes and type 2 diabetes. Insulin resistance means your body is unable to…

  • A woman lying in bed stares at clock in the middle of the night. Insomnia is a sleep disorder where people have trouble falling asleep, staying asleep, or both. It’s more common in older adults and women.

    Insomnia

    Insomnia is a sleep disorder that happens when you have trouble falling asleep, staying asleep, or both. It’s more common…

  • Tick with its head sticking in human skin, red blotches indicate an infection

    Insect-borne Diseases

    Insect-borne diseases can come from mosquitoes, sand flies, ticks, and fleas. They include Zika virus, Yellow Fever, and Lyme…

  • hand holding a lubrication spray can

    Inhalant Use

    Inhalant use is a form of substance use disorder that involves breathing in or sniffing household products on purpose to…

  • closeup of person cutting toenails

    Ingrown Toenails

    An ingrown toenail occurs when the side or corner of the nail curls down and digs into the skin of…

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