Elementary students
Learning Center
Plague
Learn about the symptoms, risk factors and treatment of this rare, potentially fatal disease that's usually passed on by fleas.
Cushing syndrome
High levels of the hormone cortisol in your body cause this endocrine disorder. Learn about symptoms, causes and treatment.
Granuloma annulare
Learn about this painless skin condition mainly affecting young adults in which bumps form a ring. The rash can be long lasting or recur after treatment.
Behcet's disease
This rare disorder causes blood vessel inflammation throughout the body. Signs and symptoms depend on which parts of the body are affected.
Retinal detachment
Eye floaters and reduced vision are signs of possible retinal detachment. Find out about causes and treatment for this eye emergency.
Lichen planus
Learn about the causes, symptoms and treatment of this condition that causes swelling and irritation in the skin, hair, nails, mouth and vagina.
Anal fissure
Learn what causes a tear in the anus and how to prevent or treat this often painful condition.
Intestinal gas
This frequently uncomfortable symptom is part of proper digestion. Find out when it might be cause for concern.
Low blood oxygen (hypoxemia)
Learn causes of low blood oxygen and find out when to call your doctor.
Coughing up blood
Coughing up blood: Symptom — Comprehensive overview covers possible causes of coughing up blood.
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