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Secondhand smoke is the smoke you are exposed to when someone nearby is smoking. It includes the smoke exhaled by the smoker, and the smoke given off directly by the burning tobacco.

Thrombocytopenia occurs when there are fewer platelets in the blood than normal. Platelets help stop or control bleeding when you have a cut or wound. If you have thrombocytopenia, you may be at higher risk for bruising and bleeding.

Fertilizers aren't dangerous to handle, but chemicals used to control pests and weeds can be highly toxic. Here are tips for correct use.

Your child has a sore mouth and throat. This might be mucositis. It's a common, short-term side effect of many kinds of cancer treatment. Though it can be painful, it goes away over time after treatment ends.

A diagnosis of cancer for your child is scary and confusing. Learn the basics about acute lymphoblastic leukemia.

X-linked agammaglobulinemia is a rare genetic disease that causes a weakened immune system. It mainly affects boys.

Chemotherapy is the use of medicines to treat cancer or kill cancer cells. Read on to learn more about what to expect when your child needs this treatment.

A stem cell transplant uses stem cells to replace bone marrow that contains cancer. Learn more.

Chemotherapy is a treatment that uses medicines to destroy cancer cells. It's an important part of treatment for most people with non-Hodgkin lymphoma. Here's what you need to know.

Some types of non-Hodgkin lymphoma may be treated with a stem cell transplant. Learn more about this complex treatment and how it is done.