Neuromuscular scoliosis is a sideways curve of the spine that develops in children who have conditions affecting their nerves and muscles. Unlike other forms of spinal curvature, this type often appears early in childhood and tends to worsen over time, affecting how children sit, stand, and move.

Neuromyelitis optica spectrum disorder is a rare autoimmune condition that attacks the nervous system, primarily affecting the eyes and spinal cord, and can lead to severe disability including blindness and paralysis if left untreated.

Neuromyopathy, commonly known as peripheral neuropathy, is a condition that affects nerves outside the brain and spinal cord, causing pain, weakness, numbness, and tingling—most often in the hands and feet.

Neuropathic arthropathy is a rapidly destructive joint condition that develops when damaged nerves prevent you from feeling pain and injuries in your joints. Without the warning signal of pain, repeated injuries can cause severe joint damage, deformity, and disability.

Peripheral neuropathy affects millions of people worldwide, causing damage to nerves outside the brain and spinal cord. This condition often leads to pain, numbness, and weakness, particularly in the hands and feet, significantly impacting daily life and quality of activities.

Neurotrophic keratopathy is a rare degenerative disease of the cornea that can lead to vision loss if left untreated. The hallmark of this condition is reduced or absent sensation in the cornea, making it difficult for patients to feel damage until the disease has progressed significantly.

Neutropenia is a condition where you have too few neutrophils in your blood, a type of white blood cell that helps your body fight infections. People with neutropenia are more vulnerable to infections because their body has fewer defenses against germs.

Nicotine dependence is a powerful addiction that affects millions of people worldwide, making it extremely difficult to stop using tobacco products even when people know the serious health risks.

Niemann-Pick disease is a group of rare inherited conditions that affect how the body breaks down and uses fats inside cells. When these fats build up in organs like the brain, liver, spleen, and lungs, cells stop working properly and eventually die, leading to serious health problems that worsen over time.

Waking up multiple times each night to urinate can disrupt your sleep and leave you exhausted during the day. This common condition, called nocturia, affects more than half of adults over 50 and can significantly impact your quality of life.

Nodal marginal zone B-cell lymphoma is a rare, slow-growing type of blood cancer that develops when white blood cells called B lymphocytes grow out of control in the lymph nodes.

Nodal osteoarthritis is the most common type of osteoarthritis, predominantly affecting women in their sixth decade of life, with a strong genetic component that influences which joints develop painful bony nodules.

Nodular melanoma is an aggressive type of skin cancer that grows quickly and deeply into the skin. Though it represents only 15% to 20% of all melanoma cases, it causes about half of all melanoma-related deaths, making early detection and treatment critical.

Non-cirrhotic portal hypertension is a rare condition where blood pressure increases in the veins that carry blood to the liver, without the presence of cirrhosis or liver scarring. Unlike the more common form of portal hypertension caused by advanced liver disease, people with this condition often have relatively preserved liver function despite experiencing serious complications.

Non-Hodgkin’s lymphoma is a group of cancers that develop in the lymphatic system, a network of vessels and glands that helps protect your body from infection and disease. When cells in this system grow out of control, they form tumors that can affect lymph nodes and spread to other parts of the body.

When Non-Hodgkin lymphoma returns after successful treatment or doesn’t respond as expected, it presents new challenges. However, many treatment options remain available, and doctors can often control the disease or even aim for a cure, depending on your specific situation.

When Non-Hodgkin’s lymphoma doesn’t respond to treatment or comes back after initial success, it presents significant challenges—but new therapies and approaches continue to offer hope for patients facing this difficult situation.

Aggressive non-Hodgkin lymphomas grow and spread quickly, requiring immediate treatment — but many patients can be cured with intensive combination therapy.

Indolent non-Hodgkin’s lymphoma is a slow-growing type of blood cancer that develops in the lymphatic system. While it usually cannot be cured in advanced stages, most patients can live for many years with proper management.

Non-obstructive cardiomyopathy is a form of heart muscle disease where the heart thickens but does not block blood flow in the same way as the obstructive form, yet it can still cause serious symptoms and complications that affect daily life.

Non-clear cell renal cell carcinoma represents a diverse group of kidney cancers that behave differently from the more common clear cell type, presenting unique challenges in diagnosis and treatment.

Non-small cell lung cancer is the most common type of lung cancer, accounting for about 80% to 85% of all lung cancer cases. It happens when normal cells in your lungs change and grow out of control, usually developing more slowly than other forms of lung cancer but often spreading before symptoms appear.

When non-small cell lung cancer spreads beyond the lungs to distant parts of the body, it becomes metastatic—a condition that brings unique challenges but also growing hope through advancing treatments and supportive care approaches.

Recurrent non-small cell lung cancer means the cancer has returned after treatment. Even after successful treatment that achieves remission, between 30% and 55% of patients develop recurrence, though modern treatments offer hope and new options for managing the disease when it returns.

Stage I non-small cell lung cancer is an early form of the disease where the tumor is small and has not spread beyond the lung. With proper treatment, many people with this stage have a good chance of living for many years.

Stage II non-small cell lung cancer means doctors have found one or more tumors in your lung that have started to spread, but only within the lung or to nearby lymph nodes. While the cancer is more extensive than stage I, surgery and other treatments can often remove it successfully, giving many patients a good chance at longer survival.

Stage 3 non-small cell lung cancer represents a complex form of lung disease where cancer has spread beyond the lungs to nearby tissues and lymph nodes, but not to distant organs. About 30% of people with non-small cell lung cancer are diagnosed at this stage, facing a challenging but potentially treatable condition.

Stage IIIA non-small cell lung cancer represents a complex middle ground in cancer care—the disease has spread beyond the lungs to nearby lymph nodes but has not reached distant parts of the body. About 30% of people with non-small cell lung cancer are diagnosed at stage 3, facing challenging but potentially treatable disease that requires a carefully coordinated approach from multiple medical specialists.

Stage IIIB non-small cell lung cancer represents an advanced form of the disease where cancer has spread beyond the lung to nearby structures and lymph nodes, yet has not reached distant organs. Understanding this stage and the available treatment options is essential for making informed decisions about care.

Stage IV non-small cell lung cancer means the disease has spread from the lungs to distant areas of the body. Although it usually can’t be cured, a variety of treatments can slow the cancer’s growth and help manage symptoms.

Noninfective chorioretinitis is an inflammatory condition affecting the back of the eye that can seriously threaten your vision if left untreated. Unlike infections, this condition stems from the body’s own immune system or other non-infectious causes.

Noonan syndrome is a genetic condition that affects many parts of the body, causing distinctive facial features, heart problems, short stature, and other health challenges that vary widely from person to person.

Normal pressure hydrocephalus is a brain condition that happens when fluid builds up inside your skull, causing walking problems, memory difficulties, and loss of bladder control. While these symptoms can look like dementia or Parkinson’s disease, this condition is sometimes treatable and even reversible with surgery.

Notalgia paresthetica is a nerve disorder that causes intense itching, burning, or tingling in a specific patch of skin on your upper back, usually between your shoulder blade and spine. Although it can be uncomfortable and frustrating, the condition is not dangerous to your health.

NTRK gene fusions represent a rare but critical genetic change that can drive cancer development across many different types of tumors, affecting both adults and children.

Obesity is a chronic disease affecting millions of people worldwide, characterized by excessive body fat that can harm health and quality of life. It goes beyond appearance, involving complex interactions between genetics, behavior, environment, and metabolism, and requires comprehensive, long-term management strategies.

Obliterative bronchiolitis is a rare but serious lung disease where the smallest airways become inflamed, damaged, and scarred. This scarring causes permanent narrowing of these airways, making it progressively harder to breathe. While the disease cannot be cured, treatments can help manage symptoms and slow its progression.

Obsessive-compulsive disorder is a mental health condition where unwanted, intrusive thoughts drive people to perform repetitive behaviors over and over again, often consuming hours each day and interfering with normal life activities.

Obstructive airways disorder affects millions of people worldwide, making it difficult to breathe and limiting daily activities. Understanding this condition and its management can help improve quality of life and reduce serious complications.

Obstructive pancreatitis is a form of chronic pancreatitis that develops when something blocks or narrows the main pancreatic duct, causing inflammation and damage to the pancreas over time.

Obstructive sleep apnoea syndrome is a common sleep disorder that causes you to stop breathing repeatedly throughout the night, leaving you exhausted during the day and putting your health at serious risk if left untreated.

Ocular hypertension means the pressure inside your eye is higher than normal, but without damage to the optic nerve. While it often causes no symptoms, this condition affects millions of people and requires careful monitoring to prevent vision loss from glaucoma.

Ocular lymphoma is a rare cancer that originates in white blood cells and can affect any part of the eye and surrounding tissues, often mimicking common eye conditions and making diagnosis challenging.

Ocular melanoma is the most common eye cancer in adults and the second most common type of melanoma after skin melanoma, yet it remains largely unknown to the public despite affecting approximately 2,000 adults each year in the United States.

Ocular myasthenia is a form of myasthenia gravis where muscle weakness affects only the eyes and eyelids, causing symptoms like drooping eyelids and double vision that can vary throughout the day.

Oedema is swelling caused by excess fluid trapped in the body’s tissues, most commonly affecting the feet, ankles, and legs, though it can occur anywhere in the body.

Peripheral oedema is swelling in the lower legs, ankles, feet, or hands caused by a buildup of fluid in the body’s tissues, ranging from minor discomfort after prolonged sitting to a sign of serious heart, kidney, or liver disease.

Oesophageal achalasia is a rare swallowing disorder where damaged nerves prevent the muscles of the food pipe from working properly, making it difficult to swallow food and drink. Though there is no cure, symptoms can usually be managed with treatment options ranging from medication to surgery.

Oesophageal adenocarcinoma is a type of cancer that begins in the glandular cells of the lower part of the food pipe, where it meets the stomach. This cancer has become more common in recent decades, especially in the United States and western Europe, and most often affects men over the age of 50.

Stage 2 oesophageal adenocarcinoma is a type of cancer that begins in the gland cells of the oesophagus and has grown into deeper layers of the oesophagus wall, sometimes spreading to nearby lymph nodes, but has not reached other parts of the body.

Stage 3 oesophageal adenocarcinoma is a serious form of cancer where the disease has grown deeper into the oesophagus and may have spread to nearby lymph nodes, but has not reached distant parts of the body. Understanding this stage helps patients and their families prepare for treatment and know what to expect.

Oesophageal atresia is a birth defect where a baby’s food tube doesn’t connect properly to the stomach, making it impossible to swallow or feed normally. Most babies need surgery shortly after birth to repair this condition.

Metastatic oesophageal cancer means that cancer which started in the food pipe has spread to distant parts of the body. This advanced stage affects around half of all patients at the time of diagnosis and presents complex challenges that require comprehensive care and support.

Oesophageal carcinoma is a cancer that starts in the oesophagus, the muscular tube that carries food from your throat to your stomach. Most people don’t notice symptoms until the disease has progressed, making early detection challenging but crucial for better outcomes.

Oesophageal disorders are a collection of conditions that affect the tube carrying food from your mouth to your stomach, with symptoms ranging from heartburn to difficulty swallowing that can significantly impact your daily life.

When a piece of food gets stuck in the tube that carries food from your mouth to your stomach, it creates a frightening situation that sends thousands of people to the emergency room each year. While many cases resolve on their own, some require urgent medical attention to prevent serious complications.

Oesophageal squamous cell carcinoma is a type of cancer that affects the esophagus, the muscular tube connecting your throat to your stomach. This form of cancer usually develops in the upper or middle part of the esophagus and often remains undetected until advanced stages, making early recognition and proper treatment critical.

Oesophageal squamous cell carcinoma metastatic represents the most advanced form of esophageal cancer, where cancer cells have spread beyond the esophagus to distant parts of the body such as the liver, lungs, or bones, fundamentally changing both treatment approaches and patient outlook.

Stage II oesophageal squamous cell carcinoma represents a stage where the cancer has grown deeper into the layers of the oesophagus and may have reached nearby lymph nodes, but has not spread to distant organs.

Stage III oesophageal squamous cell carcinoma is an advanced form of cancer that affects the food pipe, where the disease has spread beyond the oesophagus lining into deeper tissues or nearby lymph nodes, but has not yet reached distant parts of the body.