A person with TB infection can have latent (not active) infection, or they can have active disease. A person with a latent infection does not have symptoms. A small number of bacteria are in their body, but they are not causing illness. Latent infection can become active, resulting in symptoms. Approximately 10% of people in the U.S with latent infection develop active disease.
Symptoms of active infection depend on where the infection is located. Most TB infections are in the lungs. Symptoms might include:
- Fatigue
- Cough lasting more than 3 weeks
- Coughing up blood
- Chest pain
- Fever
- Chills
- Night sweats
- Loss of appetite
- Weight loss
It is possible but less common for TB infection to occur in the brain, kidney, spine, larynx, kidneys, lymph nodes, bones, and joints.