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These images show how to safely sit using a walker.

Aniridia means lack of an iris. It is a rare disorder in which the iris of the eye is partly or completely missing. Here are details on treatments and complications.

Hard nodules can sometimes form inside the thyroid gland. You may notice a small bump in the gland area. Thyroid nodules are common. The nodules are often not dangerous. But in some cases, they can be thyroid cancer. A thyroid FNA biopsy can test for cancer.

Aortic valve regurgitation is when the aortic valve leaks. In many cases, mild to moderate aortic valve regurgitation just needs to be monitored. More severe cases often need surgery. Here's what you need to know about treatment.

Aspiration is when something enters the airway or lungs by accident. It may be food, liquid, or some other material. This can cause serious health problems, such as pneumonia. Aspiration can happen when a person has dysphagia. It can also happen if a child has gastroesophageal reflux disease.

Your carotid dissection may need to be treated in a hospital. Treatment choices depend on your age, overall health, and symptoms.

Central auditory processing disorder (CAPD) is a problem with listening. It may be from a problem with the way the brain processes sound (auditory) information. It causes a child to have trouble hearing and understanding speech and sounds.

Computer vision syndrome is a group of eye problems. These problems are due to a lot of computer use. Treatment is done by making changes in your use of computer or digital screens.

Arthritis is a type of damage to a joint that can cause inflammation. AC arthritis affects the acromioclavicular (AC) joint. This joins the shoulder blade (scapula) and the collarbone (clavicle). AC arthritis is fairly common in older adults.