Jan. 9, 2025 -- Multiple sclerosis (MS) is a complex condition that affects the brain and spinal cord. How does MS impact the body? What are the symptoms of MS? We spoke with Michael Levy, MD, PhD, to ...

Mast cell activation syndrome is a condition that causes mast cells to release an inappropriate amount of chemicals into your body. This causes allergy symptoms and a wide range of other symptoms.

Teratomas are rare tumors that contain different types of tissues such as bone, teeth, muscle, and hair. A teratoma may be cancerous or benign (noncancerous), depending on its structure. Most are ...

When you are in the early stage of recovery from opioid use disorder or dependence, there’s a 90% chance that you will experience post-acute withdrawal syndrome, or PAWS. Knowing what to expect and ...

Spasmodic dysphonia (or laryngeal dystonia) is a rare voice disorder that is thought to happen when your brain sends abnormal signals to your vocal folds. It only affects about 1 in 100,000 people.

‌Cedar fever, also called allergic rhinitis, isn’t exactly what it sounds like. It usually doesn't involve a fever. It's not the flu or a virus — it’s an extreme allergy. Cedar fever is common in ...

Herpangina is a viral infection that usually affects children. It's caused by the coxsackie virus and sometimes by other types of viruses. The symptoms are fever, sore throat, and small painful ...

Diamine oxidase (DAO) is a digestive enzyme that rids your body of histamine. Histamine is a signal protein important for digestion, allergic response, immunity, and more. Experts don't agree, but ...

Avoidant restrictive food intake disorder (ARFID) is an eating disorder. If you have it, you'll limit the amount and type of food you eat. Doctors sometimes call ARFID a selective eating disorder.