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Eye Anatomy and Function

… enters the eye by opening and closing the pupil. The iris uses muscles to change the size of the pupil. These muscles … Tightening (contraction) or relaxing these muscles causes the lens to change shape, allowing the eyes to focus on … the cornea and the pupil at the front of the eye and is focused by the lens onto the retina at the back of the eye. The …

Appendicitis

… Basics What is appendicitis? Appendicitis is one of the causes of serious belly pain. It happens when the appendix , a … does in the body, but most of the time it doesn't cause problems. Appendicitis is most common in people ages 10 … But without treatment, the appendix may burst and cause infection throughout the belly. This can be very …

Talking About Suicide to Someone Youre Worried About

… suicide, self-harm, a mental health crisis, a substance use crisis, or any other kind of emotional distress, get … Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of …

Advance Care Planning for Your Child

… guide your child's future treatment, comfort, and care. Use these ideas to help with your planning. Talk with your … Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of …

Teens Supporting a Friend Who Is Struggling Emotionally

Cancer Support Life After Treatment

… you may not have enough energy to do all the things you used to do. Let your family know that you still need their … may be different now too. You may have new friends because of cancer. You may have grown closer to some of the … with people who understand what you're going through because they've been there too. Current as of: March 1, …

Parkinson-Plus Syndromes

… features. These syndromes can be hard to diagnose because the symptoms are like those of other conditions. The … (PSP) is a rare disorder. Like Parkinson's disease, it causes problems with balance when a person walks or stands. … atrophy (MSA) Multiple system atrophy (MSA) is a term used for a group of rare disorders that reduce the function …

Voice Problems

… any of these body parts can lead to a voice problem. What causes them? Anyone can develop a voice problem, but your risk … voice problem—it just helps your doctor pinpoint the cause of your voice problem. How are voice problems treated? … voice to return to normal, depending on the severity and cause of your voice problem. How do you know if your voice …

Spondylolisthesis

… your spinal cord or nerve roots being squeezed. This can cause back pain and numbness or weakness in one or both legs. … your leg may feel tight or weak. You may even limp. What causes it? Spondylolisthesis may be caused by problems with the small joints in your back. (The …

Bowel Obstruction

… the intestines in the normal way. The blockage may cause severe pain that comes and goes. What causes it? Tumours, scar tissue from past surgeries … or twisting or narrowing of the intestines can cause a bowel obstruction. These are called mechanical …