Mark Gurarie

Fever can be a symptom of pneumonia, but it is possible to have pneumonia with no fever. Learn more about how it’s diagnosed.

Contact dermatitis is characterized by inflammatory skin symptoms that appear after touching an irritating substance or an allergen.

Your skin's pH (positive hydrogen) balance measures how acidic or alkaline (also called basic) it is.

Gastrointestinal (GI) diseases affect your digestive system, causing a wide range of symptoms and altering the function or structure of the digestive system.

Villi are tiny tissues on the walls of the small intestine that play an important role in digestion and help your body absorb nutrients from food.

Alanine aminotransferase (ALT) is an enzyme found mainly in your liver. High levels of ALT in the blood may be a sign of liver disease or damage.

Celiac disease is a chronic autoimmune disorder triggered by consuming gluten. The main treatment for celiac disease is adopting a gluten-free diet.

Stable angina is a type of chest pain that occurs during or after emotional stress and physical activity. It's often an early sign of heart disease.