Nonalcoholic fatty liver disease (NAFLD) is an umbrella term for a range of liver conditions affecting people who drink little to no...

Acne is a skin condition that occurs when your hair follicles become plugged with oil and dead skin cells. It causes whiteheads,...

Adult attention-deficit/hyperactivity disorder (ADHD) is a mental health disorder that includes a combination of persistent problems,...

Overview Sexually transmitted diseases (STDs) — or sexually transmitted infections (STIs) — are generally acquired by sexual contact. The...

Heart failure occurs when the heart muscle doesn't pump blood as well as it should. When this happens, blood often backs up and fluid can...

Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory lung disease that causes obstructed airflow from the lungs....

Menopause is the time that marks the end of your menstrual cycles. It's diagnosed after you've gone 12 months without a menstrual period....

Clinical research is medical research involving people. There are two types, observational studies and clinical trials. Observational...

A migraine is a headache that can cause severe throbbing pain or a pulsing sensation, usually on one side of the head. It's often...

Hair loss (alopecia) can affect just your scalp or your entire body, and it can be temporary or permanent. It can be the result of...

A hot flash is the sudden feeling of warmth in the upper body, which is usually most intense over the face, neck and chest. Your skin...

Atopic dermatitis (eczema) is a condition that causes dry, itchy and inflamed skin. It's common in young children but can occur at any...