Acid reflux and GERD: Acid reflux symptoms are caused when stomach contents flow up from the stomach back into the esophagus, causing symptoms like heartburn, stomach pain, and burping. Learn more the causes, symptoms, and treatment of acid reflux and GERD.

Heartburn: Heartburn is a burning sensation in your chest that often occurs with a bitter taste in your throat or mouth. Find out how to recognize, treat, and prevent heartburn.

Epiglottitis: Epiglottitis is characterized by inflamed tissue in your epiglottis. It's a potentially life-threatening condition. Learn who gets it, why, and how it's treated. This condition is considered a medical emergency. Urgent care may be required.

Goiter: Your thyroid is a gland found in your neck just below your Adam's apple. A condition that increases the size of your thyroid is called a goiter. Read more about the causes and symptoms of goiter.

Esophagitis: Esophagitis is inflammation of the esophagus that can be caused by acid reflux or certain medications. Learn more about the types of esophagitis and their treatments.

Esophageal cancer: Esophageal cancer occurs when a malignant (cancerous) tumor forms in the lining of the esophagus, which can cause difficulty swallowing. Read more about esophageal cancer, its causes, diagnosis, and treatment.

Stomach cancer (gastric adenocarcinoma): Stomach cancer occurs when cancerous cells form in the stomach lining. Because it's difficult to detect, it's often not diagnosed until it's more advanced. Learn about the symptoms, diagnosis, treatment, and prognosis of stomach cancer.

Herpes esophagitis: Herpes esophagitis is caused by the herpes simplex virus type 1 (HSV-1). The infection can cause some chest pain and difficulty swallowing. Learn more about how herpes esophagitis is diagnosed and treated.

Recurrent herpes simplex labialis: Recurrent herpes simplex labialis, also known as oral or orolabial herpes, is an infection of the mouth area caused by the herpes simplex virus. Read about symptoms, treatment, and prevention of this infection.

Thyroid nodule: A thyroid nodule is a lump that can develop in your thyroid gland. It can be solid or filled with fluid. You can have a single nodule or a cluster of nodules. Learn what causes thyroid nodules and how they are treated.

Infectious mononucleosis: Infectious mononucleosis, or mono, refers to a group of symptoms usually caused by the Epstein-Barr virus (EBV). Learn about the symptoms and treatments for infectious mononucleosis.

Snake bites: A bite from a venomous snake should always be treated as a medical emergency. Even a bite from a harmless snake can lead to an allergic reaction or infection. Read more about what to do in the event of a snake bite.