conditions

Complete heterochromia is a rare condition in which a person has two different colored irises. It differs from partial or sectoral heterochromia, where color variation occurs wi...

Choanal atresia is a congenital narrowing or blockage of the back of the nasal airway (choana), present from birth. It occurs when bone or tissue separates the nose from the thr...

Heterochromia is the condition in which the irises of the eyes are different colors. It can be complete, with each iris a distinct color, or partial, when only part of one iris...

A Schmorl node is a herniation of intervertebral disc material into the adjacent vertebral body through the endplate. When nodes are large, numerous, or associated with inflamma...

Light flashes in the eye, often described as streaks, sparks, or brief arc-like lights, commonly appear when the vitreous gel inside the eye rubs or pulls on the retina. Many pe...

A lupus rash is often a visible sign of systemic inflammation and can be one of the earliest reasons people seek care. The most common pattern is a facial rash that spreads acro...

Many people experience persistent daytime sleepiness and wonder whether it signals narcolepsy. A narcolepsy quiz can be a practical first step, helping to organize symptoms, ide...

Cheyne-Stokes respiration (CSR) is a cyclic breathing pattern marked by a gradual increase and then decrease in breathing effort, followed by a period of apnea. It is commonly o...

Starting sertraline (Zoloft) is a common treatment for depression, anxiety, and several other conditions. During the first week, many people notice changes in sleep, appetite, e...