what's inside: diseases & conditions

Know how to prevent, treat and control the symptoms of various diseases and medical conditions. We explain what's happening in your body when disease strikes, and what you can do to feel better faster.

Allergies

Allergies

Foods, drugs and the environment are all reasons that some people experience allergic reactions. Explore the immune system and find out what leads to a misdirected immune response. See more »

Cancer

Cancer

This section covers cancer types, causes and symptoms as well as the signs of cancer, tests and treatments. See more »

Diabetes

Diabetes

Understand diabetes and how your body uses insulin to handle glucose. You'll also find information about the impact of diabetes on other systems in the body. See more »

Gastrointestinal Conditions

Gastrointestinal Conditions

Digestive acids that end up in the wrong place can cause heartburn and stomach ulcers. Find out what happens and causes those painful burning sensations. See more »

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Musculoskeletal Conditions

Musculoskeletal Conditions

Musculoskeletal conditions can occur in many parts of the body. Find information on chronic conditions such as arthritis, back pain and foot pain. See more »

Neurological Conditions

Neurological Conditions

Amnesia, autism and coma are major neurological conditions covered in this section. Also included in the Neurological Conditions section are helpful exercises and strategies to improving your memory. See more »

Respiratory Conditions

Respiratory Conditions

Respiratory conditions impact the lungs and the ability to breath. In this section, find out about the symptoms and treatment of apnea, orthopnea and more. See more »

Skin Conditions

Skin Conditions

Chicken pox has plagued millions, moles vary in size, shape and color, and your skin turns red or brown when exposed to the sun. These are all very common skin conditions, find out more about them in this section. See more »

featured articles

FPO

How Osteogenesis Imperfecta Works

How could a high-five or a handshake lead to a wrist fracture? People with osteogenesis imperfecta must carefully consider these seemingly innocent actions to prevent broken bones.

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Symptom Checker:

  Abdominal Bloating   Abdominal Fullness Prematurely Afte...   Abdominal Lumps   Abdominal Mass   Abdominal Pain   Abdominal Rigidity   Abdominal Sounds   Abdominal Swelling   Abnormal Posturing   Abnormal Tooth Shape   Abnormally Dark Or Light Skin   Absent Menstruation   Absent Thirst   Agitation   Ambiguous Genitalia   Ankle Pain   Appetite Decrease   Appetite Increase   Apraxia   Arachnodactyly   Armpit Lump   Autistic Behavior   Babinski's Reflex   Bed Wetting   Belching   Binge Eating   Blackheads   Bleeding Gums   Bleeding Into The Skin   Blindness   Blockage Of Leg Arteries   Blood In The Semen   Blood in Urine   Bloody Or Tarry Stools   Bone Pain Or Tenderness   Bounding Pulse   Bowel Incontinence   Breast Lump   Breast Pain   Breath Odor   Breath Sounds   Breathing - Slowed Or Stopped   Breathing Difficulty   Breathing Difficulty When Lying Dow...   Breathing That Sounds Abnormal   Broad Nasal Bridge   Bulging Fontanelles   Bullae   Chemosis   Chest Pain   Chills   Clammy Skin   Claw Foot   Claw Hand   Cloudy Cornea   Clubbing Of The Fingers Or Toes   Cold Intolerance   Coloboma Of The Iris   Comedones   Confusion   Constipation   Contracture Deformity   Coughing   Coughing Up Blood   Crying Excessively in Infants   Cyst   Decerebrate Posture   Decorticate Posture   Decreased Consciousness   Decreased Urine Output   Delayed Growth   Delayed or Absent Tooth Formation   Depression   Diarrhea   Difficulty with Urination   Dizziness   Drooling   Drowsiness   Dry Eyes   Dry Hair   Dry Skin   Ear Discharge   Earache   Earlobe Creases   Elbow Pain   Epicanthal Folds   Erection Problems   Erosion   Excessive Or Unwanted Hair In Women   Excessive Thirst   Excessive Urination   Excessive Urination at Night   Excessively Large Fontanelles   Eye Burning, Itching and Discharge   Eye Pain   Eye Redness   Eye Slant   Eyelid Drooping   Eyes That Bulge   Face Pain   Facial Paralysis   Facial Swelling   Fainting   Fatigue   Female Sexual Dysfunction   Fever   Finger Pain   Fingers That Change Color   Flank Pain   Floating Stools   Focal Neurological Deficits   Foot Pain   Foot, Leg, And Ankle Swelling   Foul Smelling Stools   Frequent Or Urgent Urination   Frontal Bossing   Gas (Flatulence)   Gastrointestinal Bleeding   Genital Sores (Female)   Genital Sores (Male)   Groin Lumps   Groin Pain   Gynecomastia   Hair Loss   Hallucinations   Hand Or Foot Spasms   Hand Tremors   Hearing Loss   Heart Murmurs And Other Sounds   Heart Palpitations   Heartburn   Heat Intolerance   Heavy, Prolonged, or Irregular Mens...   Heel Pain   Hemolytic Crisis   Hepatomegaly   Heterochromia   Hiccups   Hip Pain   Hoarseness Or Changing Voice   Hump Behind The Shoulders   Hyperactivity   Hyperelastic Skin   Hypermobile Joints   Hyperventilation   Hypotonia   Impaired Smell   Increased Head Circumference   Indigestion   Infantile Reflexes   Insect Bites And Stings   Intercostal Retractions   Intertrigo   Irritability   Itching   Jaundice (Yellow Skin)   Joint Pain   Joint Swelling   Knee Pain   Leg Pain   Lichenified   Limited Range Of Motion   Lordosis   Low Nasal Bridge   Lower Back Pain   Macule   Malaise   Memory Loss   Metopic Ridge   Microcephaly   Micrognathia   Morbid Obesity   Morning Sickness   Moro Reflex   Motormental Retardation   Mouth Sores   Muscle Aches   Muscle Atrophy   Muscle Cramps   Muscle Function Loss   Muscle Twitching   Nail Abnormalities   Nasal Congestion   Nasal Discharge   Nasal Flaring   Natal Teeth   Nausea And Vomiting   Neck Lumps   Neck Pain   Night Blindness   Nightmares   Nikolsky’s Sign   Nipple Discharge   Nodules   Nosebleed   Numbness And Tingling   Obesity   Opisthotonos   Pain During Sexual Intercourse   Painful Menstrual Periods   Painful Urination   Pale or Clay-Colored Stools   Paleness   Papule   Patches   Patchy Skin Color   Pectus Carinatum   Pectus Excavatum   Penis Pain   Photophobia   Pilonidal Dimple   Pinna Abnormalities And Low-set Ear...   Point Tenderness   Polydactyly   Polyhydramnios   Poor Feeding In Infants   Preauricular Tag Or Pit   Premenstrual Breast Tenderness and ...   Prognathism   Pupils That Are Different Sizes   Purpura   Pustules   Rapid Shallow Breathing   Rash in a Child Under 2 Years   Rashes   Rib Cage Pain   Ridged Sutures   Scales   Scrotal Swelling   Seizures   Sensorineural Deafness   Separated Sutures   Shin Splints   Short Philtrum   Short Stature   Shoulder Pain   Simian Crease   Skeletal Limb Abnormalities   Skin Blushing/flushing   Skin Discoloration   Skin Lumps   Skin Turgor   Sleeping Difficulty   Sneezing   Snoring   Sore Throat   Spasticity   Speech Impairment (adult)   Splenomegaly   Splinter Hemorrhages   Strange Behavior   Stress And Anxiety   Striae   Subcutaneous Emphysema   Sunburn   Sunken Fontanelles   Supernumerary Nipples   Swallowing Difficulty   Swallowing Pain Or Burning   Sweating   Sweating Decrease   Swelling   Swollen Glands   Swollen Gums   Taste Impairment   Telangiectasia   Tenesmus   Testicle Lump   Testicle Pain   Tinnitus   Tongue Problems   Tooth Discoloration   Toothaches   Ulcers   Uncontrollable Eye Movements   Uncontrollable Movement   Uncontrolled Or Slow Movement   Uncoordinated Movement   Unpredictable Or Jerky Movement   Urinary Incontinence   Urine Discoloration   Vaginal Bleeding Between Periods   Vaginal Bleeding In Pregnancy   Vaginal Discharge   Vaginal Itching   Vesicles   Vision Problems   Vomiting Blood   Walking Abnormalities   Watery Eyes   Weak or Absent Pulse   Weakness   Webbing Of The Fingers Or Toes   Weight Gain   Weight Loss   Wheezing   White Spots in the Pupil   Whitehead   Widely Spaced Teeth   Wrinkles   Wrist Pain   Yawning

Diseases and Conditions Glossary:

  ABO Incompatibility   AIDS   ARDS (acute Respiratory Distress Sy...   Aarskog Syndrome   Aase Syndrome   Abdominal Aortic Aneurysm   Abortion - Complete   Abortion - Elective Or Therapeutic   Abortion - Incomplete   Abortion - Infected   Abortion - Threatened   Abscess   Acanthosis Nigricans   Achalasia   Achilles Tendinitis   Achondrogenesis   Achondroplasia   Acidosis   Acne   Acoustic Neuroma   Acoustic Trauma   Acquired Platelet Function Defect   Acrodermatitis   Acrodysostosis   Acromegaly   Actinic Keratosis   Actinomycosis   Acute Adrenal Crisis   Acute Arterial Occlusion - Kidney   Acute Bilateral Obstructive Uropath...   Acute Bronchitis   Acute Cerebellar Ataxia   Acute Cholecystitis (Gallstones)   Acute Cytomegalovirus (CMV) Infecti...   Acute Gouty Arthritis   Acute HIV Infection   Acute Interstitial Nephritis Not NS...   Acute Kidney Failure   Acute Lymphocytic Leukemia (ALL)   Acute Lymphocytic Leukemia In-Depth   Acute Mountain Sickness   Acute Myeloid Leukemia   Acute Nephritic Syndrome   Acute Pancreatitis   Acute Tubular Necrosis   Acute Unilateral Obstructive Uropat...   Acute Upper Airway Obstruction   Addison’s Disease   Adenomyosis   Adhesion   Adjustment Disorder   Adolescent Depression   Adolescent Pregnancy   Adrenocortical Carcinoma   Adrenoleukodystrophy   Adult Still's Disease   Agammaglobulinemia   Age-related Hearing Loss   Agoraphobia   Agranulocytosis   Aicardi Syndrome   Albinism   Alcohol Withdrawal   Alcoholic Cardiomyopathy   Alcoholic Ketoacidosis   Alcoholic Liver Disease   Alcoholic Neuropathy   Alcoholism   Alcoholism In-Depth   Alkalosis   Alkaptonuria   Allergic Conjunctivitis   Allergic Rhinitis   Allergic Rhinitis In-Depth   Allergic Vasculitis   Allergies   Allergy To Mold - Dander - Dust   Alop