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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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  • 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 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.

  • Tuberous Sclerosis

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

  • Tuberculosis

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

  • Trigeminal Neuralgia

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

  • 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…

  • 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…

  • Illustration of blood vessels

    Transient Ischemic Attack

    A transient ischemic attack is a type of stroke. It is often called a warning stroke because it increases the…

  • 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

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

  • 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…

  • Toxic Shock Syndrome | Symptoms and Causes

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

  • 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…

  • 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

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

  • . 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…

  • 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…

  • 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,…

  • 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.

    Thyroiditis

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

  • Thyroid Nodules

    A thyroid nodule is a lump in the thyroid gland in your neck. More than 90% of them are not…

  • Thalassemia is a group of inherited blood disorders that prevent your body from producing the amount of hemoglobin it needs.

    Thalassemia

    Thalassemia is a group of inherited blood disorders that prevent your body from producing the amount of hemoglobin it…

  • A man sits on an exam table in a doctor’s office. Testicular torsion is an emergency that happens when a man’s testicles rotate and the spermatic cord becomes twisted. It can occur at any age.

    Testicular Torsion

    Testicular torsion happens when a man’s testicles rotate and the spermatic cord becomes twisted. This can happen at any…

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