Diseases and Conditions

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


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  • Woman holding throat in pain. When you have Hashimoto’s disease, your immune system attacks the thyroid gland. When this happens, your thyroid can’t make hormones normally.


    Learn about the types, symptoms, causes, diagnosis and treatment of thyroiditis, a name for several disorders that cause inflammation of…

  • Tick-Borne Relapsing Fever

    Tick-borne relapsing fever (TBRF) is a bacterial infection spread by ticks. It shows up as repeated episodes of fever, headaches,…

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

  • . Closeup of the broken cigarette on female hand.

    Tobacco Addiction

    Smoking or chewing tobacco is very dangerous for your health, but there are many resources available to help you…

  • Doctor examining a child, checking her throat and tonsils. Common tonsillitis symptoms include redness and feeling like your throat or neck glands are swollen due to inflammation of the tonsils.


    Tonsillitis is an inflammation of the tonsils that happens when they become infected by a virus or bacteria. It is…

  • Smiling school children stand against a fence on the playground. Tourette syndrome is a movement disorder that causes a person to make repeated, uncontrolled twitches, movements, or sounds known as tics.

    Tourette Syndrome and Tics

    Tourette syndrome is a movement disorder that causes a person to make repeated, uncontrolled twitches, movements, or sounds. It starts…

  • Toxic Shock Syndrome

    Toxic shock syndrome is a serious, sometimes life-threatening staph infection caused by bacteria that multiplies quickly and leads to organ…

  • A gloved hand holds a magnifying glass up to a model of a hip joint. Transient synovitis of the hip, also called toxic synovitis, is an inflammation and swelling of the tissues around the hip joint.

    Toxic Synovitis, or Transient Synovitis of the Hip

    Learn about the symptoms, causes, diagnosis and treatment of transient synovitis of the hip, a condition that causes sudden hip…

  • Toxoplasma gondii on colorful background. Protozoan, which is transmitted from cats and other animals and causes toxoplasmosis, is especially dangerous for pregnant women. 3D illustration.


    Toxoplasmosis is an infection caused by a parasite called Toxoplasma gondii.

  • Illustration of blood vessels

    Transient Ischemic Attack (TIA)

    A transient ischemic attack (TIA) is a stroke. It is considered a “warning” stroke. It significantly increases your risk of…

  • Female doctor wrapping the head of a young man with gauze

    Traumatic Brain Injury

    A traumatic brain injury is any sudden injury to your brain. It could be from a bump, blow, or jolt…

  • Traveler’s Diarrhea

    Traveler’s diarrhea is a common travel-related illness that anyone can get when traveling to certain areas. Most cases are mild…

  • Trigeminal Neuralgia

    Trigeminal neuralgia is a condition that causes burning, electric or shock-like pain in the face. It is caused by a…

  • Tuberculosis

    Tuberculosis is an infection caused by bacteria. Tuberculosis usually affects the lungs. But it can also affect your joints, kidneys,…

  • Tuberous Sclerosis

    Tuberous sclerosis is a rare disease that causes tumors, or growths, in the brain and other organs. They are usually…

  • 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.

  • newborn baby wrapped up in a blanket sleeping

    Undescended Testicles

    Testicles are part of the male body. They usually move from inside the body to the scrotum at birth. If…

  • Photo of a new diaper from the top angle looking in

    Urinary Incontinence

    Urinary incontinence is the loss of bladder control. This means that you can’t always control when you urinate.

  • Urinary Tract Infection

    Learn about the symptoms, causes, diagnosis, treatment, prevention and complications of urinary tract infections (sometimes called UTIs or bladder…

  • A medical drawing of uterine fibroids in and around the uterus.

    Uterine Fibroids

    Fibroids are benign growths (not cancer) in the muscular wall of the uterus.