What is a common symptom of tuberculosis?

A common symptom of tuberculosis (TB) is a bad cough that lasts for three weeks or longer. This characteristic cough is persistent and can be accompanied by other symptoms such as chest pain, coughing up blood or sputum, and fatigue. TB primarily affects the lungs, and the prolonged nature of the cough is indicative of the infection. It's important for healthcare professionals to recognize this symptom, as early diagnosis and treatment are crucial for managing tuberculosis and preventing its spread to others. The other options do not align with typical symptoms associated with TB; for instance, coughing up food is more indicative of gastrointestinal issues, while rapid weight gain and an increase in appetite are not symptoms of an infectious disease like TB, which typically leads to weight loss and decreased appetite.