HUMIRA is a TNF blocker medicine that affects the immune system and can lower the body's ability to fight infections. Serious infections have happened in people taking HUMIRA. These serious infections include tuberculosis (TB) and infections caused by viruses, fungi, or bacteria that have spread throughout the body. Some people have died from these infections. People should be tested for TB before HUMIRA use and monitored for signs and symptoms of TB during therapy, even if their TB test was negative. People at risk of TB may be treated with medicine for TB. Treatment with HUMIRA should not be started in a person with an active infection, unless approved by a doctor. HUMIRA should be stopped if a person develops a serious infection. People should tell their doctor if they live in or have been to a region where certain fungal infections are common, as these infections may happen or become more severe if people use HUMIRA. People should tell their doctor if they have had TB or hepatitis B, are prone to infections, or have symptoms such as fever, fatigue, cough, or sores.