--- title: "Condition Library - Browse Health Conditions A to Z | infoMD" description: "Browse infoMD's complete condition library. Find in-depth guides to symptoms, causes, diagnosis, and treatment for hundreds of health conditions." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "CollectionPage", "name": "Condition Library", "description": "Browse infoMD's complete condition library. Find in-depth guides to symptoms, causes, diagnosis, and treatment for hundreds of health conditions.", "url": "https://infomd.com/conditions" }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://infomd.com" }, { "@type": "ListItem", "position": 2, "name": "Conditions", "item": "https://infomd.com/conditions" } ] } ] --- [Skip to main content](#main-content) [![infoMD](/assets/infomd-logo-CtvTblFD.png)](/) [Home](/) [Conditions](/conditions) [Glossary](/glossary)[Shop](/shop) 1. [Home](/) 2. Conditions # Condition Library In-depth guides to health conditions - symptoms, causes, diagnosis, and treatment [A](#letter-A)[B](#letter-B)[C](#letter-C)[D](#letter-D)[E](#letter-E)[F](#letter-F)[G](#letter-G)[H](#letter-H)[I](#letter-I)[J](#letter-J)[K](#letter-K)[L](#letter-L)[M](#letter-M)[N](#letter-N)[O](#letter-O)[P](#letter-P)[Q](#letter-Q)[R](#letter-R)[S](#letter-S)[T](#letter-T)[U](#letter-U)[V](#letter-V)[W](#letter-W)[X](#letter-X)[Y](#letter-Y)[Z](#letter-Z) AllCardiovascularDigestiveNeurologicalRespiratoryMusculoskeletalEndocrineImmune SystemMental HealthSkin ## A [ ### Atherosclerosis Cardiovascular Atherosclerosis occurs when fatty deposits called plaques build up inside artery walls, narrowing the vessels and restricting blood flow. Over time, this can lead to heart attacks, strokes, or peripheral artery disease depending on which arteries are affected. Chest pain or angina Leg pain when walking Shortness of breath Chronic Learn More ](/conditions/atherosclerosis)[ ### Atrial Fibrillation Cardiovascular Atrial fibrillation is the most common type of irregular heartbeat, where the heart's upper chambers beat chaotically and out of sync with the lower chambers. This increases the risk of blood clots, stroke, and heart failure. Heart palpitations Fatigue Dizziness or lightheadedness Episodic Learn More ](/conditions/atrial-fibrillation)[ ### Asthma Respiratory Asthma is a chronic respiratory condition in which the airways become inflamed and narrowed, making breathing difficult. Triggers like allergens, exercise, cold air, or respiratory infections can cause flare-ups (asthma attacks) with coughing, wheezing, and chest tightness. Wheezing Shortness of breath Chest tightness Chronic Learn More ](/conditions/asthma)[ ### ADHD Mental Health ADHD is a neurodevelopmental disorder characterized by persistent patterns of inattention, hyperactivity, and impulsivity that interfere with functioning and development. While often thought of as a childhood condition, ADHD frequently persists into adulthood and can significantly affect work, relationships, and self-esteem. Difficulty sustaining attention Easily distracted Hyperactivity or restlessness Chronic Learn More ](/conditions/adhd) ## B [ ### Bipolar Disorder Mental Health Bipolar disorder is a mental health condition marked by extreme shifts in mood, energy, and activity levels that cycle between manic highs and depressive lows. These episodes can last days to weeks and significantly disrupt daily functioning, relationships, and judgment. Extreme mood swings Manic episodes with high energy Depressive episodes with deep sadness Chronic Learn More ](/conditions/bipolar-disorder) ## C [ ### Crohn's Disease Digestive Crohn's disease is a type of inflammatory bowel disease that causes chronic inflammation anywhere in the digestive tract, most commonly the end of the small intestine. It can penetrate deep into bowel tissue and lead to serious complications including strictures and fistulas. Persistent diarrhea Abdominal pain and cramping Blood in stool Chronic Learn More ](/conditions/crohns-disease)[ ### COPD Respiratory COPD is a group of progressive lung diseases - primarily emphysema and chronic bronchitis - that cause airflow obstruction and breathing difficulties. Smoking is the leading cause, and the disease worsens over time, making everyday activities increasingly challenging. Chronic cough with mucus Shortness of breath during activities Wheezing Chronic Learn More ](/conditions/copd)[ ### Celiac Disease Immune System Celiac disease is a genetic autoimmune disorder in which eating gluten - a protein found in wheat, barley, and rye - triggers an immune response that damages the small intestine's lining. This prevents proper nutrient absorption and can lead to a wide range of symptoms beyond the digestive system. Chronic diarrhea or constipation Bloating and abdominal pain Unintended weight loss Genetic Learn More ](/conditions/celiac-disease) ## E [ ### Epilepsy Neurological Epilepsy is a neurological disorder characterized by recurrent, unprovoked seizures caused by abnormal electrical activity in the brain. Seizures can range from brief lapses in attention to full-body convulsions, and the condition can significantly impact daily life and safety. Recurrent seizures Temporary confusion Loss of consciousness Chronic Learn More ](/conditions/epilepsy)[ ### Eczema Skin Eczema is a chronic inflammatory skin condition that causes the skin to become red, itchy, dry, and cracked. Flare-ups can be triggered by allergens, irritants, stress, temperature changes, and certain foods. While there is no cure, most people can effectively manage symptoms. Intense itching Red or brownish-gray patches Dry, cracked, scaly skin Chronic Learn More ](/conditions/eczema) ## F [ ### Fibromyalgia Musculoskeletal Fibromyalgia is a chronic condition characterized by widespread musculoskeletal pain, fatigue, and tenderness, often accompanied by sleep problems, memory issues, and mood disturbances. Researchers believe it amplifies painful sensations by affecting the way the brain processes pain signals. Widespread body pain Chronic fatigue Cognitive difficulties (fibro fog) Chronic Learn More ](/conditions/fibromyalgia) ## G [ ### GERD Digestive GERD occurs when stomach acid frequently flows back into the esophagus, irritating its lining and causing persistent heartburn. If left untreated, chronic acid exposure can lead to esophagitis, Barrett's esophagus, and an increased risk of esophageal cancer. Burning chest pain (heartburn) Acid regurgitation Difficulty swallowing Chronic Learn More ](/conditions/gerd)[ ### Generalized Anxiety Disorder Mental Health GAD is a mental health condition characterized by persistent, excessive worry about a variety of everyday topics that is difficult to control and interferes with daily life. People with GAD often anticipate disaster and may be overly concerned about money, health, family, or work. Persistent excessive worry Restlessness or feeling on edge Muscle tension Chronic Learn More ](/conditions/generalized-anxiety-disorder) ## H [ ### Hypertension Cardiovascular Hypertension is a chronic condition where blood pressure in the arteries remains persistently elevated, increasing the risk of heart disease, stroke, and kidney damage. It is often called the 'silent killer' because it rarely causes noticeable symptoms until significant damage has occurred. Headaches Shortness of breath Nosebleeds Chronic Learn More ](/conditions/hypertension)[ ### Heart Failure Cardiovascular Heart failure is a progressive condition in which the heart muscle becomes too weak or stiff to pump blood efficiently, causing fluid to back up in the lungs, abdomen, and extremities. It does not mean the heart has stopped but rather that it cannot meet the body's needs. Swelling in legs and ankles Persistent cough or wheezing Fatigue and weakness Chronic Learn More ](/conditions/heart-failure)[ ### Hypothyroidism Endocrine Hypothyroidism occurs when the thyroid gland doesn't produce enough thyroid hormones, slowing down the body's metabolism. This causes a wide range of symptoms including fatigue, weight gain, cold intolerance, and depression that often develop so gradually they go unnoticed for years. Fatigue Weight gain Cold intolerance Chronic Learn More ](/conditions/hypothyroidism) ## I [ ### Irritable Bowel Syndrome Digestive IBS is a common functional gastrointestinal disorder characterized by recurring abdominal pain, bloating, and changes in bowel habits without any visible damage to the digestive tract. Triggers often include certain foods, stress, and hormonal changes. Abdominal cramping Bloating and gas Diarrhea or constipation Chronic Learn More ](/conditions/irritable-bowel-syndrome) ## L [ ### Lupus Immune System Lupus is a chronic autoimmune disease in which the immune system attacks healthy tissue throughout the body, causing widespread inflammation and damage. It can affect the joints, skin, kidneys, brain, heart, and lungs, with symptoms that flare and remit unpredictably. Butterfly-shaped facial rash Joint pain and swelling Extreme fatigue Chronic Learn More ](/conditions/lupus) ## M [ ### Migraine Neurological Migraine is a neurological condition that causes intense, throbbing headaches often accompanied by nausea, vomiting, and extreme sensitivity to light and sound. Attacks can last hours to days and may be preceded by warning signs called aura, which include visual disturbances or tingling. Severe throbbing head pain Nausea and vomiting Light and sound sensitivity Episodic Learn More ](/conditions/migraine)[ ### Multiple Sclerosis Neurological Multiple sclerosis is an autoimmune disease in which the immune system attacks the protective myelin sheath covering nerve fibers, disrupting communication between the brain and body. Symptoms vary widely depending on which nerves are affected and can range from mild numbness to severe disability. Numbness or tingling in limbs Vision problems Muscle weakness or spasms Chronic Learn More ](/conditions/multiple-sclerosis)[ ### Metabolic Syndrome Endocrine Metabolic syndrome is a cluster of interconnected conditions - elevated blood pressure, high blood sugar, excess body fat around the waist, and abnormal cholesterol levels - that occur together and dramatically increase the risk of heart disease, stroke, and type 2 diabetes. Large waist circumference High blood pressure Elevated blood sugar Chronic Learn More ](/conditions/metabolic-syndrome)[ ### Major Depressive Disorder Mental Health Major depressive disorder is a serious mental health condition that causes persistent feelings of sadness, hopelessness, and a loss of interest in activities once enjoyed. It affects how a person thinks, feels, and handles daily activities, and can lead to significant impairment in all areas of life. Persistent sadness or emptiness Loss of interest in activities Changes in appetite or weight Episodic Learn More ](/conditions/major-depressive-disorder) ## O [ ### Osteoarthritis Musculoskeletal Osteoarthritis is the most common form of arthritis, occurring when the protective cartilage that cushions the ends of bones gradually wears down over time. This causes pain, stiffness, and reduced mobility, most often in the knees, hips, hands, and spine. Joint pain during or after movement Joint stiffness after rest Loss of flexibility Chronic Learn More ](/conditions/osteoarthritis) ## P [ ### Parkinson's Disease Neurological Parkinson's disease is a progressive neurodegenerative disorder that occurs when nerve cells in the brain that produce dopamine gradually break down. This leads to worsening motor symptoms including tremor, stiffness, and difficulty with balance and coordination. Tremor at rest Muscle stiffness and rigidity Slow movement (bradykinesia) Chronic Learn More ](/conditions/parkinsons-disease)[ ### Polycystic Ovary Syndrome Endocrine PCOS is a hormonal disorder causing enlarged ovaries with small cysts on the outer edges. It leads to irregular menstrual periods, excess androgen levels, and difficulty conceiving. PCOS is also associated with insulin resistance, weight gain, and an increased risk of type 2 diabetes. Irregular or missed periods Excess facial and body hair Acne Chronic Learn More ](/conditions/polycystic-ovary-syndrome)[ ### Psoriasis Skin Psoriasis is a chronic autoimmune skin condition that speeds up the life cycle of skin cells, causing them to build up rapidly on the surface. This results in thick, red, scaly patches that can be itchy, painful, and emotionally distressing. It is not contagious. Red, raised patches with silvery scales Dry, cracked skin that may bleed Itching or burning sensation Chronic Learn More ](/conditions/psoriasis) ## R [ ### Rheumatoid Arthritis Musculoskeletal Rheumatoid arthritis is an autoimmune disease in which the immune system mistakenly attacks the lining of the joints, causing painful swelling, joint erosion, and deformity. Unlike osteoarthritis, RA can also affect other organs including the skin, eyes, lungs, and heart. Swollen, tender joints Joint stiffness worse in mornings Fatigue and fever Chronic Learn More ](/conditions/rheumatoid-arthritis)[ ### Rosacea Skin Rosacea is a chronic inflammatory skin condition that primarily affects the central face, causing redness, visible blood vessels, bumps, and in some cases eye irritation. Triggers include sun exposure, hot drinks, spicy foods, alcohol, and stress. Without treatment, it tends to worsen over time. Facial redness and flushing Visible blood vessels on face Bumps or pimples on cheeks and nose Chronic Learn More ](/conditions/rosacea) ## S [ ### Sleep Apnea Respiratory Sleep apnea is a sleep disorder in which breathing repeatedly stops and starts during sleep, causing fragmented rest, oxygen drops, and excessive daytime sleepiness. The most common form, obstructive sleep apnea, occurs when throat muscles relax and block the airway. Loud snoring Gasping or choking during sleep Excessive daytime sleepiness Chronic Learn More ](/conditions/sleep-apnea) ## T [ ### Type 2 Diabetes Digestive Type 2 diabetes is a metabolic disorder in which the body becomes resistant to insulin or doesn't produce enough insulin to maintain normal blood sugar levels. Chronically elevated blood sugar damages blood vessels, nerves, and organs throughout the body. Increased thirst and frequent urination Unexplained weight loss Blurred vision Chronic Learn More ](/conditions/type-2-diabetes) ### Browse by Body System - [Cardiovascular](/conditions/body-system/cardiovascular) - [Digestive](/conditions/body-system/digestive) - [Neurological](/conditions/body-system/neurological) - [Respiratory](/conditions/body-system/respiratory) - [Musculoskeletal](/conditions/body-system/musculoskeletal) - [Endocrine](/conditions/body-system/endocrine) - [Immune System](/conditions/body-system/immune-system) - [Mental Health](/conditions/body-system/mental-health) - [Skin](/conditions/body-system/skin) ### Most Common Conditions - [Hypertension](/conditions/hypertension) - [Atrial Fibrillation](/conditions/atrial-fibrillation) - [Heart Failure](/conditions/heart-failure) - [Irritable Bowel Syndrome](/conditions/irritable-bowel-syndrome) - [Type 2 Diabetes](/conditions/type-2-diabetes) - [Migraine](/conditions/migraine) - [Parkinson's Disease](/conditions/parkinsons-disease) - [Asthma](/conditions/asthma) ## Stay Informed. Live Better. Get evidence-based health articles delivered to your inbox weekly. No spam, unsubscribe anytime. Email addressSubscribe #### Explore - [Condition Library](/conditions) - [Health Glossary](/glossary) - [Shop](/shop) #### Body Systems - [Cardiovascular](/conditions/body-system/cardiovascular) - [Digestive](/conditions/body-system/digestive) - [Neurological](/conditions/body-system/neurological) - [Respiratory](/conditions/body-system/respiratory) - [Musculoskeletal](/conditions/body-system/musculoskeletal) - [Endocrine](/conditions/body-system/endocrine) - [Immune System](/conditions/body-system/immune-system) - [Mental Health](/conditions/body-system/mental-health) - [Skin](/conditions/body-system/skin) #### Company - [About infoMD](/about) - [Contact Us](/contact) - [844-357-3601](tel:+18443573601) #### Legal - [Privacy Policy](/privacy-policy) - [Terms of Use](/terms-of-use) - [Disclaimer](/disclaimer) - [Cookie Policy](/cookie-policy) - [Accessibility](/accessibility) © 2026 infoMD LLC. All rights reserved. For informational purposes only. See our [Disclaimer](/disclaimer). [About](/about)[Contact](/contact)[Privacy Policy](/privacy-policy)[Terms of Use](/terms-of-use)