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What are anal fissures? An anal fissure is a small crack or tear in the thin, moist lining of the lower rectum. It’s a common condition. Sometimes people confuse anal fissures with hemorrhoids. Vis...

What is alcohol use disorder? Alcohol use disorder is a serious problem. It is a pattern of drinking too much alcohol too often. It interferes with your daily life. You may be suffering from alcoho...

What is adult ADHD? Visit Our Interactive Symptom Checker Choose a symptom and answer simple questions using our physician-reviewed Symptom Checker to find more information on your health issue. Wh...

What is acute bronchitis? Acute bronchitis is a contagious viral infection that causes inflammation of the bronchial tubes. These are the airways that carry air into your lungs. When these tubes ge...

STI Symptoms and Prevention: What You Need to Know Sexually transmitted infections (STIs) are common, but many people don’t recognize the signs or know how to protect themselves. Understanding STI ...

What is a stroke? A stroke is a life-threatening, medical emergency that happens when there is a loss of blood flow to part of the brain. When a stroke occurs, it causes a portion of your brain cel...

What is pneumonia? Pneumonia is an infection of the lungs. It causes the air sacs (alveoli) of the lungs to get inflamed (irritated and swollen). They may fill up with fluid or pus. This causes a v...

A migraine is usually an intense pounding headache that can last for hours or even days. The pounding or pulsing pain usually begins in the forehead, the side of the head, or around the eyes. The h...

What is obesity? Obesity is a complex and increasingly common disease that is associated with many health risks such as high blood pressure, diabetes, heart disease, certain cancers, and even death...

What is lactose intolerance? Lactose intolerance is your body’s inability to digest foods with lactose in them. Lactose is the sugar found in milk and foods made with milk (ice cream, cheese). Some...