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Disease

X-linked agammaglobulinemia

This genetic disease weakens the immune system, mainly in males, and leads to having infections often.
Disease

Fever

Medications can lower a fever, but sometimes it's better left untreated. Fever may play a role in helping your body fight off infections.
Disease

Systemic mastocytosis

Too many mast cells can build up in skin, bone and organs. When triggered, the cells let out chemicals that can cause allergic reactions and organ damage.
Disease

Drug allergy

Learn which medicines are more likely to cause an allergic reaction, what symptoms look like and what treatments can calm such a reaction.
Disease

Heart murmurs

An irregular heart sound may be harmless or worrisome. Know the causes of heart murmurs and when treatment is needed.
Disease

Phenylketonuria (PKU)

PKU is caused by a change in the gene that helps create an enzyme needed to break down phenylalanine. Treatment includes a special diet and medication.
Disease

Nasopharyngeal carcinoma

Nasopharyngeal carcinoma is cancer that happens in the nasopharynx, which sits behind the nose and above the back of the throat.
Disease

Tricuspid valve regurgitation

A leaky tricuspid valve may make you feel tired and have difficulty exercising. Learn how this type of heart valve disease is diagnosed and treated.
Disease

Pulmonary valve disease

Learn about the types of lung valve disease and treatment options at Mayo Clinic.
Disease

Ventricular fibrillation

Without fast treatment, this heart rhythm problem can cause death within minutes. Learn the symptoms of VFib and what actions to take to save a life.
Disease

Bicuspid aortic valve

This condition, present at birth, affects the valve between the lower left heart chamber and the body's main artery. Know the symptoms and treatment.
Disease

Bedsores (pressure ulcers)

These areas of damaged skin and tissue are caused by sustained pressure — often from a bed or wheelchair — that reduces blood flow to vulnerable areas of the body.
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