Nasal polyps are soft, painless, noncancerous growths that develop on the lining of the nasal passages or sinuses. They result from long-term inflammation and are often associated with conditions such as chronic sinusitis, asthma, or allergies. Nasal polyps vary in size and may occur in clusters, potentially blocking airflow and normal sinus drainage when they become large. Symptoms Small nasal …

Nasal and paranasal tumors are abnormal growths that develop in the nasal cavity or the paranasal sinuses, which are air-filled spaces around the nose. These tumors can be benign or malignant and are relatively rare. Because the nasal cavity and sinuses are close to the eyes, brain, and important nerves, even noncancerous tumors can cause significant symptoms if they grow …

Narcissistic personality disorder is a mental health condition characterized by a persistent pattern of grandiosity, an excessive need for admiration, and a lack of empathy for others. People with this disorder often have an inflated sense of self-importance and believe they are superior, while being highly sensitive to criticism. Narcissistic personality disorder typically begins in early adulthood and can significantly …

A quadriceps tendon tear is a musculoskeletal injury involving a partial or complete rupture of the tendon that connects the quadriceps muscle group to the top of the kneecap (patella). This tendon plays a critical role in straightening the knee and supporting movements such as walking, running, and jumping. Quadriceps tendon tears are more common in middle-aged and older adults …

Quadrantanopia is a visual field defect in which one-quarter of the visual field is lost in one or both eyes. It usually results from damage to specific parts of the brain involved in visual processing rather than a problem with the eyes themselves. The condition can affect daily activities such as reading, driving, and navigating surroundings, depending on which quadrant …

Q fever is a zoonotic infectious disease caused by the bacterium Coxiella burnetii. It primarily affects animals such as cattle, sheep, and goats, but humans can become infected through exposure to contaminated environments. Q fever occurs worldwide and can present as either an acute or chronic illness. While many infections are mild or asymptomatic, some cases can lead to serious …

Myxofibrosarcoma is a rare type of soft tissue sarcoma that develops from connective tissues, most commonly affecting the arms and legs. It usually occurs in older adults and is characterized by slow-growing tumors that may appear painless in the early stages. Although myxofibrosarcoma often grows slowly, it has a tendency to recur locally after treatment and, in some cases, spread …

Nearsightedness, also known as myopia, is a common vision condition in which close objects are seen clearly, while distant objects appear blurred. It occurs when light entering the eye focuses in front of the retina instead of directly on it. Nearsightedness often begins in childhood or adolescence and may worsen as the eyes continue to grow. The condition can usually …

Myofascial pain syndrome is a chronic pain condition that affects the muscles and the connective tissue surrounding them, known as fascia. It is characterized by localized areas of muscle tightness called trigger points, which can cause pain both at the site and in other parts of the body. This condition often develops due to muscle overuse, repetitive movements, or prolonged …

Myoclonus is a neurological condition characterized by sudden, brief, involuntary muscle jerks. These movements can involve a single muscle, a group of muscles, or multiple areas of the body. Myoclonus can occur as a normal phenomenon, such as hiccups or sleep-related jerks, or as a symptom of an underlying medical or neurological disorder. The severity of myoclonus varies widely. Some …