All Diseases

Tapeworm infection is caused by ingesting food or water contaminated with tapeworm eggs or larvae. If you ingest certain tapeworm eggs, they can migrate outside your intestines and form larval cysts in body tissues and organs (invasive infection). If you ingest tapeworm larvae, however, they develop into adult tapeworms in your intestines (intestinal infection).

An adult tapeworm consists of a head, neck and chain of segments called proglottids. When you have an intestinal tapeworm infection, the tapeworm head adheres to the intestinal wall, and the proglottids grow and produce eggs. Adult tapeworms can live for up to 30 years in a host. Intestinal tapeworm infections are usually mild, but invasive larval infections can cause serious complications.

Teen depression is a serious medical problem that causes a persistent feeling of sadness and loss of interest in activities. It affects how your teen thinks, feels and behaves, and it can cause emotional, functional and physical problems. Although mood disorders, such as depression, can occur at any time in life, symptoms may be different between teens and adults.

Issues such as peer pressure, academic expectations and changing bodies can bring a lot of ups and downs for teens. But for some teens, the lows are more than just temporary feelings — they're a symptom of depression.

Teen depression isn't a weakness or something that can be overcome with willpower — it can have serious consequences and requires long-term treatment. For most teens, depression symptoms ease with treatment such as medication and psychological counseling.

Temporal lobe seizures originate in the temporal lobes of your brain, which process emotions and are important for short-term memory. Some symptoms of a temporal lobe seizure may be related to these functions, including having odd feelings — such as euphoria, deja vu or fear.

During a temporal lobe seizure, you may remain aware of what's happening. During more-intense seizures, you might look awake but be unresponsive. Your lips and hands may make purposeless, repetitive movements.

Temporal lobe seizures may stem from an anatomical defect or scar in your temporal lobe, but the cause is often unknown. Temporal lobe seizures are treated with medication. For some people who don't respond to medication, surgery may be an option.

Tendinitis is inflammation or irritation of a tendon — any one of the thick fibrous cords that attaches muscle to bone. The condition causes pain and tenderness just outside a joint.

While tendinitis can occur in any of your body's tendons, it's most common around your shoulders, elbows, wrists, knees and heels.

Some common names for various tendinitis problems are:

  • Tennis elbow
  • Golfer's elbow
  • Pitcher's shoulder
  • Swimmer's shoulder
  • Jumper's knee

If tendinitis is severe and leads to the rupture of a tendon, you may need surgical repair. But most cases of tendinitis can be successfully treated with rest, physical therapy and medications to reduce pain.

Tennis elbow is a painful condition that occurs when tendons in your elbow are overworked, usually by repetitive motions of the wrist and arm.

Despite its name, most cases of tennis elbow occur in people who don't play tennis. People whose jobs feature the types of motions that can lead to tennis elbow include plumbers, painters, carpenters and butchers.

The pain of tennis elbow occurs primarily where the tendons of your forearm muscles attach to a bony bump on the outside of your elbow. Pain can also spread into your forearm and wrist.

Rest and over-the-counter pain relievers often help relieve tennis elbow. If conservative treatments don't help or if symptoms are disabling, your doctor might suggest surgery.

A tension headache is generally a diffuse, mild to moderate pain in your head that's often described as feeling like a tight band around your head. A tension headache (tension-type headache) is the most common type of headache, and yet its causes aren't well understood.

Treatments for tension headaches are available. Managing a tension headache is often a balance between fostering healthy habits, finding effective nondrug treatments and using medications appropriately.

Testicular cancer occurs in the testicles (testes), which are located inside the scrotum, a loose bag of skin underneath the penis. The testicles produce male sex hormones and sperm for reproduction.

Compared with other types of cancer, testicular cancer is rare. But testicular cancer is the most common cancer in American males between the ages of 15 and 35.

Testicular cancer is highly treatable, even when cancer has spread beyond the testicle. Depending on the type and stage of testicular cancer, you may receive one of several treatments, or a combination. Regular testicular self-examinations can help identify growths early, when the chance for successful treatment of testicular cancer is highest.

Testicular torsion occurs when a testicle rotates, twisting the spermatic cord that brings blood to the scrotum. The reduced blood flow causes sudden and often severe pain and swelling. Testicular torsion is most common between ages 12 and 16, but it can occur at any age, even before birth.

Testicular torsion usually requires emergency surgery. If treated within a few hours, the testicle can usually be saved. But waiting longer can cause permanent damage and may affect the ability to father children. When blood flow has been cut off for too long, a testicle may become so badly damaged it has to be removed.

Tetanus is a serious bacterial disease that affects your nervous system, leading to painful muscle contractions, particularly of your jaw and neck muscles. Tetanus can interfere with your ability to breathe and, ultimately, threaten your life. Tetanus is commonly known as "lockjaw."

Thanks to the tetanus vaccine, cases of tetanus are rare in the United States and the developed world. The incidence of tetanus is much higher in less developed countries. Around a million cases occur worldwide each year.

There's no cure for tetanus. Treatment focuses on managing complications until the effects of the tetanus toxin resolve. Fatality is highest in individuals who haven't been immunized and in older adults with inadequate immunization.

Tetralogy of Fallot (teh-tral-uh-je ov fuh-LOE) is a rare condition caused by a combination of four heart defects that are present at birth. These defects, which affect the structure of the heart, cause oxygen-poor blood to flow out of the heart and into the rest of the body. Infants and children with tetralogy of Fallot usually have blue-tinged skin because their blood doesn't carry enough oxygen.

Tetralogy of Fallot is often diagnosed during infancy or soon after. However, tetralogy of Fallot may not be detected until later in life, depending on the severity of the defects and symptoms. With early diagnosis followed by appropriate treatment, most children with tetralogy of Fallot live relatively normal lives, though they'll need regular medical care and may have restrictions on exercise.